Kingdom Animalia
Linnaeus, 1758
- Species in this portal
- 3037
- Ecological class
- 928 troglobionts, 609 trogloxenes, 529 stygobionts, 442 troglophiles, 267 accidentals, 159 stygoxenes and 103 stygophiles
- Realm
- Aquatic, Terrestrial
- Continent
- North America
- Countries
- Canada, Mexico, United States
- States and provinces
- 50 states and provinces
- Counties
- 988
- Karst regions
- Appalachians, Black Hills, Driftless Area, Edwards Plateau and Balcones, Florida Lime Sinks, Guadalupe Mountains, Hawaii, Interior Low Plateau, Mother Lode, Other, Ozarks
- Habitats
- Cave pool, Cave lake, Cave stream, Hypotelminorheic seepage, Sump or flooded passage, Phreatic groundwater
- Cave zone
- Deep cave
- Conservation
- 932 of 1241 ranked G1 or G2; 41 federally listed
Phyla
- Acanthocephala 2 in portal
- Annelida 85 in portal
- Arthropoda 2464 in portal
- Chordata 273 in portal
- Cnidaria 1 in portal
- Mollusca 168 in portal
- Nematoda 1 in portal
- Nematomorpha 1 in portal
- Nemertea 1 in portal
- Platyhelminthes 40 in portal
- Porifera 1 in portal
Species in this portal
- Abacion lactarium
- Abacion magnum
- Acanthocyclops brevispinosus
- Acanthocyclops einslei
- Acanthocyclops exilis
- Acanthocyclops parasensitivus
- Acanthocyclops robustus Robusthops
- Acanthocyclops venustoides
- Acanthocyclops vernalis Survannshops
- Acanthophthirius longa
- Achemenides pectinatus
- Aclodes nicuesa
- Acris blanchardi Blanchard's Cricket Frog
- Acris crepitans Northern Cricket Frog
- Acris gryllus Southern Cricket Frog
- Acroneuria abnormis Common Stone
- Acrotrichis lucidula
- Actia diffidens
- Adelocosa anops Kauai Cave Wolf Spider G1G2 HI
- Aedes abserratus Serrated Mosquito
- Aedes aurifer Golden Bog Mosquito
- Aedes canadensis Woodland Pool Mosquito
- Aedes cinereus
- Aedes communis Snow Mosquito
- Aedes fitchii
- Aedes provocans Provoking Mosquito
- Aedes punctor Moustique Pointu Provocateur Canadien
- Aedes sticticus Floodwater Mosquito
- Aedes stimulans Woodland Mosquito
- Aedes triseriatus Eastern Treehole Mosquito
- Aedes vexans Vexans Mosquito
- Agastoschizomus texanus TX
- Agelenopsis pennsylvanica Pennsylvania Grass Spider
- Agkistrodon conanti Green-Tailed Moccasin
- Agkistrodon contortrix Copperhead
- Agonum extensicolle Extensive Harp Ground Beetle
- Agonum punctiforme Punctiform Harp Ground Beetle
- Agyneta gagnei G1G2 HI
- Agyneta hedini CO, NM
- Agyneta unimaculata
- Alabamocreagris mortis Alabama pseudoscorpion G1G2 AL
- Alabamocreagris pecki G1G2 AL
- Albiorix anophthalmus G1G2 AZ
- Alectorobius concanensis
- Alectorobius kelleyi
- Aleochara castaneimarmotae
- Aleochara castaneipennis
- Aleochara fumata Rove Beetle
- Aleochara lucifuga
- Aleochara ocularis
- Alligator mississippiensis Louisiana Alligator
- Allocosa funerea
- Allocosa sublata
- Allocrangonyx hubrichti Hubricht's Long-tailed Cave Amphipod G3G4 AR, MO
- Allocrangonyx pellucidus Oklahoma Cave Amphipod G2G3 MO, OK
- Allolobophora chlorotica Green Worm
- Allomideopsis wichitaensis TX
- Alloparasitus subterraneus
- Allotexiweckelia hirsuta G2G3 TX
- Almuerzothyas comalensis GNR TX
- Alocodesmus angustatus
- Aloconota diversiseta
- Aloconota insecta Staph Beetle
- Aloconota neospelea
- Aloconota sulcifrons Sulcate-Faced Minute Rove Beetle
- Alucita huebneri
- Amara musculis
- Ambloplites rupestris Rock Bass
- Amblyopsis hoosieri Hoosier Cavefish G2 IN
- Amblyopsis spelaea Northern Cavefish G2G3 KY
- Ambystoma maculatum Spotted Salamander
- Ambystoma opacum Marbled Salamander
- Ambystoma tigrinum Eastern Tiger Salamander
- Ameiurus catus White Catfish
- Ameiurus melas Black Bullhead
- Ameiurus natalis Yellow Bullhead
- Ameiurus nebulosus Brown Bullhead
- Ameractis satis G2G4 AL, GA, TN, VA
- Americina adusta
- Americocreagris columbiana G2G3 OR, WA
- Amerigoniscus centralis G1G2 OK
- Amerigoniscus curvatus G1 GA
- Amerigoniscus georgiensis G1 GA
- Amerigoniscus gipsocolus G1G2 NM, TX
- Amerigoniscus henroti Powell Valley Terrestrial Cave Isopod G3 VA
- Amerigoniscus malheurensis G1 OR
- Amerigoniscus nicholasi G1G2 GA, TN
- Amerigoniscus proximus G1G2 GA
- Amerizus wingatei
- Ameroduvalius jeanneli G3 KY
- Amnestus subferrugineus
- Amnicola cora Foushee Cavesnail G1 AR, AZ
- Amnicola stygius Stygian cavesnail G1 MO
- Amoebaleria defessa
- Amphasia interstitialis Red-Headed Ground Beetle
- Amphibiocapillaria texensis TX
- Amplaria flucticulus CA
- Amplaria shastae G1G2 CA
- Amydria arizonella
- Amynthas diffringens Japanese Jumper
- Amynthas minimus
- Anachemmis jungi CA
- Anahita punctulata Southeastern Wandering Spider
- Anargyrtes annulata Grillo De Cueva
- Anasaitis canosus Twin-Flagged Jumping Spider
- Anaxyrus americanus American Toad
- Anaxyrus fowleri Fowler's Toad
- Anaxyrus terrestris Southern Toad
- Andrognathus corticarius Cope's Noodle Millipede
- Aneides aeneus Green Salamander
- Anevrina olympiae
- Anguilla rostrata American Eel
- Anguispira alternata
- Anguispira mordax Appalachian Tigersnail
- Anillaspis explanata CA
- Anillinus actuipennis TX
- Anillinus bexarensis TX
- Anillinus cavicola AL
- Anillinus clinei AL
- Anillinus folkertsioides
- Anillinus forthoodensis TX
- Anillinus hildebrandti AL
- Anillinus longiceps TN
- Anillinus reddelli TX
- Anillinus smokiensis TN
- Anillinus tombarri AL
- Anillinus valentinei G3G4 AL
- Anillinus wisemanensis TX
- Anisodactylus opaculus
- Anisolabis howarthi G1G2 HI
- Aniulus nigrans
- Ankyrodrilus legaeus
- Anolis carolinensis Carolina Anole
- Anopheles earlei
- Anopheles punctipennis Woodland Malaria Mosquito
- Anopheles quadrimaculatus Common Malaria Mosquito
- Anotylus exiguus Rove Beetle
- Anotylus tetracarinatus Rove Beetle
- Anthicus cervinus Cloudy Flower Beetle
- Anthrobia coylei G2 KY, TN, VA, WV
- Anthrobia monmouthia Mammoth Cave Spider G5 AL, KY, TN, VA
- Anticarsia gemmatalis Velvetbean Caterpillar
- Antrobia culveri Tumbling Creek cavesnail G1 MO
- Antrodiaetus unicolor
- Antrolana lira G2G4 VA, WV
- Antrorbis breweri Manitou cavesnail G1 AL
- Antrorbis tennesseensis Tennessee Cavesnail GNR TN
- Antroselates spiralis Shaggy cavesnail G3 IN, KY
- Antroxestoblatta immaculata
- Anurida tullbergi
- Anyphaena celer
- Aphaenogaster tennesseensis Tennessee Collared Ant
- Apheloria corrugata
- Apheloria montana
- Apheloria virginiensis Black-And-Gold Flat Millipede
- Aphrastochthonius grubbsi Grubb's Cave Pseudoscorpion G1 CA
- Aphrastochthonius pachysetus G1G2 NM
- Aphrastochthonius pecki G1 AL
- Aphrastochthonius similis Carlow's Cave Pseudoscorpion G1 CA
- Aphrastochthonius tenax G1G2 AL
- Aphredoderus gibbosus
- Aplexa hypnorum Moss Bladder Snail
- Apocheiridium reddelli G1G2 TX
- Apochthonius coecus G1G2 VA
- Apochthonius colecampi G1G2 MO
- Apochthonius diabolus G1 AR
- Apochthonius forbesi G1G2 OR
- Apochthonius grubbsi G1G2 CA
- Apochthonius hobbsi Buckskin Cave Pseudoscorpion G1 OH
- Apochthonius holsingeri G1G2 VA
- Apochthonius indianensis Indiana Cave Pseudoscorpion G1 IN
- Apochthonius malheuri Malheur Pseudoscorpion G1G2 OR
- Apochthonius minor G1 GA, TN
- Apochthonius moestus
- Apochthonius mysterius Mystery Cave Pseudoscorpion G1G2 MO
- Apochthonius paucispinosus Dry Fork Valley Cave Pseudoscorpion G1 WV
- Apochthonius russelli Russell Cave Pseudoscorpion G1 AL
- Apochthonius titanicus G2 AR
- Apochthonius typhlus Stone County Cave Pseudoscorpion G1G2 MO
- Aporrectodea longa Deep-Burrowing Longworm
- Aporrectodea rosea Pink Soilworm
- Aporrectodea trapezoides
- Aporrectodea tuberculata
- Aporrectodea turgida
- Appaleptoneta barrowsi G1 AL
- Appaleptoneta credula G1 AL
- Appaleptoneta fiskei GNR GA
- Appaleptoneta jonesi G1 AL
- Aquarius conformis
- Aquarius remigis North American Common Water Strider
- Araneus cavaticus Barn Orbweaver
- Araneus diadematus Cross Orbweaver
- Araneus marmoreus Marbled Orbweaver
- Arcteonais lomondi Aquatic Oligochaete Worm
- Arctodus simus
- Arenophilus bipuncticeps Northern Short-Clawed Centipede
- Argyrodes nephilae
- Arianops cavernensis GNR AL
- Arianops gorei TN
- Arianops jeanneli G1 VA
- Arianops pecki TN
- Arianops steevesi GNR AL
- Arianops stygica G1 TN
- Arion fasciatus Banded Slug
- Armadillidium nasatum Nosy Pill Woodlouse
- Armadillidium vulgare Common Pill Woodlouse
- Arrhopalites benitus
- Arrhopalites caecus
- Arrhopalites dubius
- Artesia subterranea G1G2 TX
- Artesia welbourni G1G2 TX
- Atheta alabama
- Atheta annexa
- Atheta klagesi
- Atheta lucifuga
- Atheta troglophila
- Atranus pubescens
- Attagenus brunneus
- Attheyella illinoisensis
- Attheyella nordenskioldi
- Attheyella nordenskioldii
- Attheyella pilosa
- Australinocreagris grahami G1G2 CA
- Austrotyla awishoshola NM
- Austrotyla coloradensis CO
- Austrotyla montivaga
- Austrotyla specus
- Austrotyla stephensoni CO
- Axonopsella bakeri FL, TX
- Azilia affinis Longjawed Orb Weavers
- Azilla affinis
- Bactrurus angulus Cumberland Gap Cave Amphipod G1 TN, VA
- Bactrurus brachycaudus G4 IL, MO
- Bactrurus cellulanus GX IN
- Bactrurus hubrichti Kansas Well Amphipod G4 KS, MO, OK, VA
- Bactrurus mucronatus G5 AR, IA, IL, IN, MI, MO, OH
- Bactrurus pseudomucronatus False Sword-tailed Cave Amphipod G2G3 AR, MO
- Bactrurus speleopolis Cave City Cave Amphipod G1 AR
- Bactrurus wilsoni G1G2 AL
- Bakerdania quadratus
- Balantiopteryx plicata Gray Sac-Winged Bat
- Balconorbis coronae TX
- Balconorbis uvaldensis Balcones ghostsnail G1G2 TX
- Banksula californica Alabaster Cave Harvestman GH CA
- Banksula galilei Galile's Cave Harvestman G1 CA
- Banksula grahami G2G3 CA
- Banksula grubbsi Grubbs' Cave Harvestman G1 CA
- Banksula martinorum Martins' Cave Harvestman G1 CA
- Banksula melones Melones Cave Harvestman G1 CA
- Banksula rudolphi Rudolph's Cave Harvestman G1 CA
- Banksula tuolumne Tuolumne Cave Harvestman G2 CA
- Banksula tutankhamen King Tut Cave Harvestman G1 CA
- Basacallis tarachodes
- Basilia boardmani
- Bathynella fraterna CA
- Bathynella germanitas CA
- Bathynella riparia CO
- Bathyphantes alboventris Notch-Tipped Shield Sheetweaver
- Bathyphantes nigrinus Donker Wevertje
- Bathyphantes pallidus Pale Sheetweb Weaver
- Bathyphantes reprobus Reprobus Sheetweb Weaver
- Bathyphantes weyeri Wide Shield Sheetweaver G4 AR, CO, IN, KY, ME, OH, ON, PA, QC, VA, WI, WV
- Batriasymmodes greeveri G1G2 TN
- Batriasymmodes monstrosus
- Batriasymmodes parki GH WV
- Batriasymmodes quisnamus G3 KY, TN
- Batriasymmodes spelaeus G3G4 AL, GA, TN
- Batriasymmodes troglodytes G1G2 AL
- Batrisodes barri G1G2 TN
- Batrisodes cavernosus G1 AL
- Batrisodes clypeospecus G1G2 TN
- Batrisodes cryptotexanus Coffin Cave Mold Beetle G2 TX
- Batrisodes denticollis
- Batrisodes dentifrons G1G2 TX
- Batrisodes fanti G1G2 TX
- Batrisodes feminiclypeus G1G2 TX
- Batrisodes ferulifer G1 TN
- Batrisodes gemmoides G1 TN
- Batrisodes gemmus G1 TN
- Batrisodes gravesi G3 TX
- Batrisodes grubbsi G1G2 TX
- Batrisodes henroti G2G3 KY
- Batrisodes hubrichti G1 KY
- Batrisodes incispes G1 TX
- Batrisodes jocuvestus G1 AL
- Batrisodes jonesi G2G3 AL
- Batrisodes krekeleri IN
- Batrisodes lineaticollis
- Batrisodes pannosus G1 TN
- Batrisodes pekinsi G1 TX
- Batrisodes profundus G1G2 AL
- Batrisodes reyesi G2G3 TX
- Batrisodes rossi
- Batrisodes schmitti
- Batrisodes shadeae G1 TX
- Batrisodes specus G3G4 AL, TN, TX
- Batrisodes subterraneus G1 AL
- Batrisodes texanus Inner Space Cavern Mold Beetle G1G2 TX
- Batrisodes tumoris G1 AL
- Batrisodes valentinei G2G4 AL, TN
- Batrisodes venyivi Helotes Cave Mold Beetle G1 TX
- Batrisodes wartoni G1G2 TX
- Bdellodrilus illuminatus
- Belba bulbipedata G1 KY
- Bembidion affine
- Bembidion lacunarium Greenbrier Riverbank Ground Beetle
- Bembidion nigripes
- Bembidion texanum Simple Riverbank Ground Beetle
- Bertkauia crosbyana
- Bibio xanthopus Yellow-Footed March Fly
- Bicornucandona fineganensis GNR TX
- Bimastos heimburgeri
- Bimastos longicinctus
- Bimastos rubidus Gilt-Tail
- Bimastos tumidus
- Bimastos zeteki
- Bishopella jonesi G1 AL
- Bishopella laciniosa Bishop's Harvestman
- Bishopella marianna
- Bittacomorpha clavipes Phantom Crane Fly
- Blaberus giganteus Caribbean Giant Cockroach
- Blackburnia aaae G1G2 HI
- Blackburnia howarthi G1G2 HI
- Blancosoma scaturgo G1G2 CO
- Blaniulus guttulatus Snake Millepede
- Blarina brevicauda
- Blarina carolinensis Southern Short-Tailed Shrew
- Bleptina caradrinalis Bent-Winged Owlet
- Boisea trivittata Boxelder Bug
- Bolitophila cinerea
- Bolitophila hybrida
- Bolitophila perlata
- Bos taurus Taurine Cattle
- Bosmina longirostris Common Long-Nosed Waterflea
- Bowmanasellus sequoiae Sequoia Cave Isopod G2 CA
- Brachinus fumans American Bombardier Beetle
- Brachycybe lecontii
- Brachycybe petasata
- Brachycybe producta
- Brachydesmus superus Compact Flat-Backed Millipede
- Brackenridgia ashleyi Ashley's Terrestrial Cave Isopod G1G3 AR, MO
- Brackenridgia cavernarum G3G4 NM, TX
- Brackenridgia reddelli G2G3 TX
- Bradycellus rupestris Rock-Dwelling Harp Ground Beetle
- Bradysia forficulata
- Brathinus nitidus
- Bremia caricis
- Bryocamptus morrisoni Morrison's Cave Copepod G3G4 IN, KY, MD
- Bryocamptus newyorkensis
- Bryocamptus nivalis
- Caconemobius albus HI
- Caconemobius howarthi Howarth's Cave Cricket G1G2 HI
- Caconemobius paralbus HI
- Caconemobius uuku HI
- Caconemobius varius Kuamana Cave Cricket G1G2 HI
- Caecidotea acuticarpa G2G3 KS, OK
- Caecidotea adenta G1G2 OK
- Caecidotea alabamensis G3G4 AL, IL, IN, KY, TN
- Caecidotea alleghenyensis Allegheny Spring Isopod G1G2 MD
- Caecidotea ancyla G3G4 AR, MO, OK
- Caecidotea antricola G5 AR, IL, KY, MO, OH, OK
- Caecidotea barri Clifton Cave Isopod G1 KY
- Caecidotea beattyi Beatty's Groundwater Isopod G3G4 IL, IN, MO
- Caecidotea bicrenata Two-toothed Cave Isopod G5 AL, IL, KY, TN
- Caecidotea bilineata G2G3 TX
- Caecidotea cannula Cannulate Cave Isopod G1 WV
- Caecidotea carolinensis Bennett's Mill Cave Isopod G2G3 NC, SC
- Caecidotea catachaetus AL, GA, TN
- Caecidotea circulus G1G2 TN
- Caecidotea cumberlandensis Cumberland Gap Cave Isopod G1G2 VA
- Caecidotea cyrtorhynchus G1 GA
- Caecidotea dauphina AL
- Caecidotea dimorpha G2G3 AR, IN, MO
- Caecidotea dunlaporum Dunlap's Groundwater Isopod GNR IN
- Caecidotea extensolinguala MO
- Caecidotea filicispeluncae Fern Cave Isopod G1 OH
- Caecidotea fisherorum GNR VA
- Caecidotea fonticulus GNR AR
- Caecidotea franzi Franz's Cave Isopod G2G4 KY, MD, PA, WV
- Caecidotea fustis Fustis Cave Isopod G3 MO
- Caecidotea hobbsi Florida Cave Isopod G1G2 FL, GA, VA
- Caecidotea insula Kindt's Cave Isopod G1 OH
- Caecidotea jordani Jordan's Cave Isopod G2G3 IN
- Caecidotea kendeighi Kendeigh's Groundwater Isopod G5 IA, IL, IN, MO, OH
- Caecidotea lesliei G1G2 IL, MO
- Caecidotea mackini GNR OK
- Caecidotea macropropoda Bat Cave Isopod G3 AR, OK
- Caecidotea metcalfi G1G2 KS
- Caecidotea nickajackensis Nickajack Cave Isopod G1 AL, AR, GA, KY, MO, TN, VA
- Caecidotea nordeni Norden's Groundwater Isopod GH MD
- Caecidotea nortoni Norton's Cave Isopod G2G3 TN
- Caecidotea ornatus G1 VA
- Caecidotea packardi G2G4 IL, KY, MO
- Caecidotea paurotrigona G1G2 LA, MS
- Caecidotea putea American Waterslaters G1G3 FL, GA
- Caecidotea recurvata Southwest Virginia Cave Isopod G5 TN, VA
- Caecidotea reddelli G3G4 TX
- Caecidotea richardsonae Tennessee Valley Cave Isopod G5 AL, GA, TN, VA
- Caecidotea rotunda Frost Cave Isopod G2G4 IN, OH
- Caecidotea salemensis Salem Cave Isopod G4 AR, MO
- Caecidotea scyphus G1G2 TN, WV
- Caecidotea serrata Serrated Cave Isopod G1G2 MO
- Caecidotea simonini G1 WV
- Caecidotea simulator G2G3 AR, KS, OK
- Caecidotea sinuncus G1 WV
- Caecidotea spatulata G3G4 IL, MO, VA
- Caecidotea steevesi Steeves' Cave Isopod G3G4 AR, KS, MO, OK
- Caecidotea stiladactyla Slender-fingered Cave Isopod G3G4 AR, MO, OK
- Caecidotea stygia Stygian Cave Isopod G5 IL, IN, KY, MO, MS, OH, TN, VA
- Caecidotea teresae GX IN
- Caecidotea tridentata G1G2 AR, IL, KS, MO, OK
- Calasellus californicus G2 CA, OR
- Calasellus longus G1 CA
- Calathaemon holthuisi Purgatory Cave Shrimp G1G2 TX
- Calathus opaculus
- Calicina cloughensis Clough Cave Harvestman G1 CA
- Califobathynella noodti CA
- Califobathynella teucherti CA
- Californibathynella californica CA
- Calileptoneta briggsi Briggs' Cave Spider G1 CA
- Callinectes sapidus American Blue Crab
- Calliphora terraenovae
- Calliphora vicina
- Calliphora vomitoria Orange-Bearded Bluebottle
- Callobius bennetti Bennett's Laceweaver
- Caloptilia alnivorella Alder Leafminer
- Calymmaria persica
- Calymmaria virginica
- Cambala annulata Violet Ridged Millipede
- Cambala hubrichti
- Cambala minor Amber Ridged Millipede
- Cambala ochra
- Cambala reddelli
- Cambala speobia G4 Mexico, TX
- Cambarincola alienus G1G2 KY, TN
- Cambarincola demissus
- Cambarincola dubius G1G2 IN
- Cambarincola fallax
- Cambarincola heterognathus
- Cambarincola holostomus
- Cambarincola leoni G3 FL
- Cambarincola leptadenus
- Cambarincola manni
- Cambarincola marthae G1G2 TN
- Cambarincola philadelphicus
- Cambarincola sheltensis G1G2 AL
- Cambarincola steevesi G3 KY
- Cambarincola susanae
- Cambarincola vitrea
- Cambarus aculabrum Benton County Cave Crayfish G1 AR, MO
- Cambarus bartonii Appalachian Brook Crayfish
- Cambarus cryptodytes Dougherty Plain Cave Crayfish G2G3 FL, GA
- Cambarus hamulatus Prickly Cave Crayfish G3G4 AL, KY, TN
- Cambarus hubbsi Hubbs' Crayfish
- Cambarus hubrichti Salem Cave Crayfish G4 MO
- Cambarus jonesi Alabama Cave Crayfish G2 AL
- Cambarus laconensis Lacon Exit Cave Crayfish G1 AL
- Cambarus latimanus Variable Crayfish
- Cambarus nerterius Greenbrier Cave Crayfish G1 WV
- Cambarus parvoculus Mountain Midget Crayfish
- Cambarus pecki Phantom Cave Crayfish G1G2 AL
- Cambarus setosus Bristly Cave Crayfish G3 AR, MO, OK
- Cambarus sheltae Shelta Cave Crayfish G1 AL
- Cambarus speleocoopi Sweet Home Alabama Cave Crayfish G1 AL
- Cambarus striatus Ambiguous Crayfish
- Cambarus subterraneus Delaware County Cave Crayfish G1 KY, OK
- Cambarus tartarus Oklahoma Cave Crayfish G1 OK
- Cambarus tenebrosus Cavespring Crayfish
- Cambarus veitchorum White Spring Cave Crayfish G1 AL
- Cambarus zophonastes Hell Creek Cave Crayfish G1 AR
- Camponotus sayi Say's Carpenter Ant
- Campostoma anomalum Central Stoneroller
- Campostoma oligolepis Largescale Stoneroller
- Canis dirus Dire Wolf
- Canis familiaris Domestic Dog
- Canis latrans Coyote
- Canis rufus Red Wolf
- Canthocamptus cavernarum
- Canthon imitator
- Carcinophora americana
- Carebara urichi
- Carnarimelita janstocki HI
- Carphophis amoenus Common Wormsnake
- Cartodere constricta Plaster Beetle
- Carychium clappi Appalachian Thorn
- Carychium exile Ice Thorn
- Carychium mexicanum Southern Thorn
- Carychium nannodes File Thorn
- Carychium riparium Floodplain Thorn
- Carychium stygium Cave thorn G3 AL, KY, TN
- Castor canadensis American Beaver
- Cathartes aura Turkey Vulture
- Catopocerus alabamae GNR AL
- Catopocerus appalachianus
- Catopocerus jonesi GNR AL
- Catops gratiosus
- Catostomus commersonii White Sucker
- Cauloxenus stygius Northern Cavefish Copepod G1G2 IN, KY
- Causeyella causeyae AR
- Causeyella dendropus Causeyella Cave Millipede G3 AR, MO
- Causeyella youngsteadtorum AR
- Cavaticovelia aaa G1G2 HI
- Cavernicola pilosa Barbeiro
- Cemophora coccinea Scarlet Snake
- Centromerus cornupalpis Eastern Spurred Sheetweaver
- Centromerus denticulatus
- Centromerus latidens
- Centromerus tennapex
- Ceraticelus fissiceps
- Ceraticelus minutus
- Ceratophysella boletivora Springtail
- Ceratophysella brevis
- Ceratophysella denticulata
- Ceratophysella engadinensis
- Ceratophysella lucifuga Wyandotte Cave Springtail GNR IL, IN
- Ceratozetes gracilis
- Cerobasis guestfalica Book Lice
- Ceuthophilus brevipes Short-Legged Camel Cricket
- Ceuthophilus carlsbadensis
- Ceuthophilus conicaudus
- Ceuthophilus elegans
- Ceuthophilus ensifer
- Ceuthophilus gracilipes Slender-Legged Camel Cricket
- Ceuthophilus isletae
- Ceuthophilus latens Black-Sided Camel Cricket
- Ceuthophilus latibuli
- Ceuthophilus longipes
- Ceuthophilus maculatus Spotted Camel Cricket
- Ceuthophilus pallidipes
- Ceuthophilus palmeri
- Ceuthophilus seclusus
- Ceuthophilus stygius Cave Camel Cricket
- Ceuthophilus virgatipes
- Ceuthophilus williamsoni
- Chaetaspis aleyorum Aley's Cave Milliped G1 MO
- Chaetaspis attenuatus AR
- Chaetaspis debilis TN
- Chaetaspis fragilis GNR KY
- Chaetaspis mollis G1 AL, TN
- Chaetogaster diaphanus Aquatic Oligochaete Worm
- Chaoborus albatus
- Chauliodes pectinicornis Summer Fishfly
- Cheiracanthium inclusum Yellow Sac Spider
- Cheiridium reyesi G1G2 TX
- Chelydra serpentina North American Snapping Turtle
- Cherokia georgiana
- Cheumatopsyche minuscula
- Chinquipellobunus madlae G4 TX
- Chinquipellobunus russelli G2G3 TX
- Chionea scita
- Chironomus decorus
- Chironomus plumosus Chironome Plumosus
- Chiroptonyssus robustipes
- Chitrella archeri G1G2 TN
- Chitrella cavicola
- Chitrella elliotti G1G2 TX
- Chitrella major G1G2 TX
- Chitrella regina Royal Syarinid Pseudoscorpion G1 WV
- Chitrella superba G1 VA
- Chitrella welbourni G1G2 NM
- Chitrellina chiricahuae G1G2 AZ
- Chlaenius aestivus Summer Harp Ground Beetle
- Chlamydotheca texasiensis
- Choctella cumminsi
- Chrosomus erythrogaster Southern Redbelly Dace
- Chrysops univittatus One-Striped Deer Fly
- Chthonius cryptus
- Chthonius paludis
- Cicurina arcata
- Cicurina arcuata
- Cicurina bandera G2G3 TX
- Cicurina bandida Bandit Cave Meshweaver G2 TX
- Cicurina baronia Robber Baron Cave Meshweaver G1 TX
- Cicurina barri G1G2 TX
- Cicurina breviaria
- Cicurina brevis Small-Eared Meshweaver
- Cicurina browni G1G2 TX
- Cicurina brunsi TX
- Cicurina bullis TX
- Cicurina buwata G1G2 TX
- Cicurina caliga GNR TX
- Cicurina cavealis
- Cicurina caverna G1G2 TX
- Cicurina coryelli G1G2 TX
- Cicurina delrio TX
- Cicurina ezelli G1G2 TX
- Cicurina gruta G1G2 TX
- Cicurina holsingeri G1G2 TX
- Cicurina hoodensis GNR TX
- Cicurina joya TX
- Cicurina loftini TX
- Cicurina machete G1G2 TX
- Cicurina madla Madla Cave Meshweaver G1 TX
- Cicurina mckenziei G1G2 TX
- Cicurina medina G1G2 TX
- Cicurina menardia G1G2 TX
- Cicurina minima
- Cicurina mirifica TX
- Cicurina mixmaster GNR TX
- Cicurina neovespera TX
- Cicurina obscura G1G2 TX
- Cicurina orellia G1G2 TX
- Cicurina pablo G1G2 TX
- Cicurina pallida
- Cicurina pastura G1G2 TX
- Cicurina patei G1G2 TX
- Cicurina placida
- Cicurina platypus TX
- Cicurina porteri G1G2 TX
- Cicurina puentecilla G1G2 TX
- Cicurina rainesi G1G2 TX
- Cicurina reclusa G1G2 TX
- Cicurina reddelli G1G2 TX
- Cicurina russelli G1G2 TX
- Cicurina sansaba G1G2 TX
- Cicurina selecta G1G2 TX
- Cicurina serena G1G2 TX
- Cicurina sheari G1G2 TX
- Cicurina sprousei G1G2 TX
- Cicurina stowersi G1G2 TX
- Cicurina suttoni G1G2 TX
- Cicurina travisae G1G2 TX
- Cicurina troglobia GNR TX
- Cicurina ubicki G1G2 TX
- Cicurina uvalde G1G2 TX
- Cicurina varians
- Cicurina venefica G1G2 TX
- Cicurina vespera Government Canyon Bat Cave Meshweaver G1 TX
- Cicurina vibora G1G2 TX
- Cicurina wartoni Warton Cave Meshweaver G1 TX
- Cicurina watersi G1G2 TX
- Cicurina wiltoni G1 AL
- Cirolanides texensis G4 Mexico, TX
- Cirolanides wassenichae TX
- Cladura flavoferruginea
- Cleidogona baroqua
- Cleidogona crucis
- Cleidogona crystallina
- Cleidogona hoffmani
- Cleidogona mayapec
- Cleidogona pecki
- Cleidogona unita
- Clethrionomys gapperi
- Climacia areolaris
- Cnephia mutata
- Coecobrya kukae G1G2 HI
- Coecobrya lua G1G2 HI
- Coecobrya nupa G1G2 HI
- Coecobrya tenebricosa
- Colliuris pennsylvanicus
- Coloradesmus aquiliensis G1G2 CO
- Coloradesmus beckleyi CO
- Coloradesmus hopkinsae CO
- Coloradesmus manitou CO
- Coloradesmus warneri CO
- Coluber constrictor North American Racer
- Columba livia Common Pigeon
- Columbasellus acheron WA
- Colusa illecta
- Comalcandona gibsoni Gibson's Groundwater Ostracod TX
- Comalcandona mixoni TX
- Comalcandona tressleri TX
- Comaldessus stygius Comal Springs Diving Beetle G1 TX
- Conasellus brevicaudus
- Conasellus burkensis GNR VA
- Conasellus communis Eastern Waterslater
- Conasellus forbesi Forbes' Waterslater
- Conasellus intermedius
- Conasellus jeffersoni VA
- Conasellus kenki G3 DC, MD, PA, VA
- Conasellus laticaudatus
- Conasellus phreaticus G2G3 VA
- Conasellus pricei Price's Cave Isopod G5 MD, PA, VA, WV
- Conasellus racovitzai
- Conasellus scrupulosus
- Conasellus washingtoni DC
- Condeicampa langei GNR TN
- Conicera similis
- Conosoma velocipes
- Conotyla blakei
- Conotyla bollmani Bollman's Cave Millipede G3 IN
- Conotyla vista GH WV
- Copestylum vesicularium Iridescent Bromeliad Fly
- Coquillettidia perturbans Cattail Mosquito
- Coragyps atratus Black Vulture
- Coras juvenilis
- Coras lamellosus
- Coras taugynus
- Corbicula fluminea Asian Basket Clam
- Cordylophora caspia Ponto-Caspian Freshwater Hydroid
- Corydalus cornutus Dobsonfly
- Corynoptera subtrivalis
- Corynorhinus rafinesquii Eastern Big-Eared Bat
- Corynorhinus townsendii Pacific Townsend's Big-Eared Bat
- Cottus bairdii Mottled Sculpin
- Cottus carolinae Banded Sculpin
- Cottus specus Grotto sculpin G2 MO
- Crangonyx anomalus Large Male Crangonyctid
- Crangonyx antennatus Appalachian Valley crangonyctid G5 AL, GA, TN, VA
- Crangonyx baculispina Lancaster County Amphipod
- Crangonyx barri Barr's Cave Amphipod G5 IN, KY
- Crangonyx bousfieldi
- Crangonyx caecus G1 KY
- Crangonyx castellanum G1 KY
- Crangonyx consimilis
- Crangonyx cooperi
- Crangonyx dearolfi Pennsylvania Cave Amphipod G2 MD, PA
- Crangonyx floridanus Florida Crangonyctid
- Crangonyx floridensis
- Crangonyx forbesi Forbes Crangonyctid
- Crangonyx gracilis Northern Lake Crangonyctid
- Crangonyx grandimanus Florida Cave Amphipod G2G3 FL
- Crangonyx hobbsi Hobb's Cave Amphipod G2G3 FL
- Crangonyx indianensis Indiana Cave Amphipod G3 IN
- Crangonyx insolitus
- Crangonyx lewisi Lewis' Cave Amphipod G2 IN, KY
- Crangonyx longidactylus
- Crangonyx manubrium Jackson County Cave Amphipod G1G2 FL
- Crangonyx minor Small Stream Crangonyctid
- Crangonyx montanus
- Crangonyx obliquus Oblique-Hand Crangonyctid
- Crangonyx ohioensis Ohio Cave Amphipod G1G2 IN, KY, OH
- Crangonyx packardi Packard's Cave Amphipod G4 IL, IN, KS, KY, MO
- Crangonyx palustris
- Crangonyx parhobbsi Florida Big Bend Cave Amphipod G1G2 FL, GA
- Crangonyx pseudogracilis Northern River Crangonyctid
- Crangonyx richmondensis Alpine Lake Crangonyctid
- Crangonyx rivularis Ontario Stream Crangonyctid
- Crangonyx setodactylus Hairy-Fingered Crangonyctid
- Crangonyx shoemakeri Shoemaker Crangonyctid
- Crangonyx specus G1 KY
- Crangonyx sulphurium Sulphurous Cave Amphipod G1 FL
- Creaserinus fodiens Digger Crayfish
- Creophilus maxillosus Hairy Rove Beetle
- Crosbycus goodnighti
- Crosbyella distincta G1G2 AR
- Crosbyella roeweri G1G2 AR
- Crosbyella spinturnix
- Crotalus adamanteus Eastern Diamond-Backed Rattlesnake
- Crotalus horridus Timber Rattlesnake
- Cryptachaea porteri Cobweb Spiders
- Cryptachaea rupicola
- Cryptobranchus alleganiensis Hellbender
- Cryptocreagris destica CO
- Cryptocreagris steinmanni CO
- Cryptophagus valens
- Ctenophthalmus pseudagyrtes
- Ctenus captiosus Florida False Wolf Spider
- Ctenus hybernalis
- Culex erraticus
- Culex pipiens Northern House Mosquito
- Culex restuans White-Dotted Mosquito
- Culex territans Northern Frog-Biting Mosquito
- Culicoides paraensis
- Culiseta impatiens Impatient Mosquito
- Cybaeopsis pantopla
- Cybaeopsis tibialis
- Cybaeus giganteus
- Cybaeus patritus
- Cyclocosmia truncata Ravine Trapdoor Spider
- Cyclocypris sharpei
- Cyclops cavernarum GNR TX
- Cyclops learii TX
- Cyclosa conica Cone-Shaped Orbweaver
- Cyclotrachelus fucatus
- Cyclotrachelus sodalis Blue-Tinged Harp Ground Beetle
- Cylindrodesmus hirsutus
- Cylindroiulus arborum
- Cylisticus convexus Curly Woodlouse
- Cyllopsis gemma Gemmed Satyr
- Cyphoderus inaequalis
- Cyphoderus similis
- Cypria lacrima GNR TX
- Cypridopsis vidua Cypris Veuve (La)
- Cyprinella spiloptera Spotfin Shiner
- Cyprinodon diabolis Devil's Hole Pupfish
- Cyprinus carpio Eurasian Carp
- Cyrtodesmus archimedes
- Dactylocythere arcuata
- Dactylocythere prionata
- Dactylocythere steevesi
- Dactylocythere ungulata
- Dactylolabis hudsonica
- Dactylolabis montana
- Dactylolabis supernumaria
- Daedalochila fatigitata
- Darlingtonea kentuckensis G3G4 KY, TN
- Darwinula stevensoni
- Dasycerus nikwasi
- Dasypus novemcinctus Nine-Banded Armadillo
- Dasyscias franzi Shaggy ghostsnail G1 FL
- Demogorgonichthys arcanus Demon Cavefish AL
- Dendrobaena octaedra Octagonal-Tail Worm
- Dendrocoelopsis americana G3 AR, MD, MO, OK, TX
- Dendrocoelopsis hymanae Lake Tahoe planarian GNR CA, NV
- Dendronucleata americana TX
- Dermacentor variabilis American Dog Tick
- Deroceras laeve Meadow Slug
- Deroceras reticulatum Gray Fieldslug
- Derops divalis
- Desmognathus abditus Cumberland Dusky Salamander
- Desmognathus brimleyorum Ouachita Dusky Salamander
- Desmognathus conanti Spotted Dusky Salamander
- Desmognathus fuscus Northern Dusky Salamander
- Desmognathus gvnigeusgwotli Cherokee Blackbelly Salamander
- Desmognathus monticola Seal Salamander
- Desmognathus ocoee Ocoee Salamander
- Desoria trispinata
- Desoria truncata
- Desoria violacea
- Deuteraphorura jana
- Diacyclops alabamensis AL
- Diacyclops bicuspidatus Damhops
- Diacyclops chrisae GA, IN, MD
- Diacyclops clandestinus
- Diacyclops conversus Blue River Groundwater Copepod G2 IN
- Diacyclops crassicaudis Kompakthops
- Diacyclops indianensis Indiana Groundwater Copepod G2 IN, TN
- Diacyclops jeanneli G1G2 IN, NC
- Diacyclops lewisi Lewis' Groundwater Copepod G1 IN
- Diacyclops navus
- Diacyclops nearcticus
- Diacyclops nikolasarburni NM
- Diacyclops salisae Salisa's Groundwater Copepod G1 IN
- Diacyclops sororum
- Diacyclops yeatmani Yeatman's Groundwater Copepod G2G3 IL, IN, MO, OK, TN
- Diadophis punctatus Ring-Necked Snake
- Dichogaster affinis Earthworm
- Dichogaster bolaui Earthworm
- Dicranomyia humidicola
- Dicranomyia stulta
- Dicranota flaveola
- Dicrotendipes neomodestus
- Didelphis virginiana Virginia Opossum
- Dineutus assimilis
- Dinocheirus astutus
- Dinocheirus cavicola G2G3 TX
- Diplectrona marianae
- Diplocardia caroliniana
- Diplocardia singularis
- Diplocardia verrucosa
- Discourella dubiosa
- Discus catskillensis Angular Disc
- Discus macclintocki Iowa Pleistocene Snail
- Discus nigrimontanus Black Mountain Disc
- Discus patulus Domed Disc
- Discus whitneyi Forest Disc
- Dissochaetus oblitus
- Docosia paradichroa
- Dohrniphora perplexa
- Dolichopeza dorsalis
- Dolichopeza tridenticulata
- Dolichopeza venosa
- Dolichopeza walleyi
- Dolichopus fulvipes
- Dolichopus penicillatus
- Dolomedes scriptus Dock Spider
- Dolomedes tenebrosus Dark Fishing Spider
- Dolomedes vittatus Banded Fishing Spider
- Donnaldsoncythere hiwasseensis
- Donnaldsoncythere tuberosa
- Dorosoma cepedianum American Gizzard Shad
- Dorypteryx domestica Cave Barklouse
- Drosophila funebris Azijnvlieg
- Dryobius sexnotatus Maple Dryobius
- Dryomyza anilis Hooded Dryomyza
- Dryophytes chrysoscelis Cope's Gray Treefrog
- Dryophytes cinereus Green Treefrog
- Dryophytes gratiosus Barking Treefrog
- Dryophytes squirellus Squirrel Treefrog
- Dryophytes versicolor Gray Treefrog
- Dugesia tigrina
- Duvalius jureceki
- Duvalius lombardii
- Eclipidrilus palustris Aquatic Oligochaete Worm
- Eidmannella bullata G1G2 TX
- Eidmannella delicata G1G2 TX
- Eidmannella nasuta G1G2 TX
- Eidmannella pallida Pallid Cave Spider
- Eidmannella reclusa G1G2 TX
- Eidmannella rostrata G4 TX
- Eidmannella tuckeri GNR TX
- Eisenia fetida Brandling
- Eisenia rosea
- Eiseniella tetraedra Square-Tailed Worm
- Eisenoides carolinensis Carolina Worm
- Eisenoides lonnbergi
- Elaphoidella bidens
- Elaphropus ferrugineus
- Elaphropus incurvus
- Elaver excepta White Sac Spider
- Eleodes eschscholtzii Pinacate De Eschscholtz
- Eleodes microps CA
- Eleutherodactylus planirostris Greenhouse Frog
- Elimia athearni Knobby Elimia
- Elimia clenchi Slackwater Elimia
- Elimia comalensis Balcones Elimia
- Elimia curvicostata
- Elimia proxima Sprite Elimia
- Elliotta howarthi G1G2 WA
- Embaphion contractum
- Embaphion contusum
- Emblyna florens
- Empherozoster antaeus
- Emplenota lucifuga
- Enoplognatha ovata Common Candy-Striped Spider
- Entocythere redelli
- Entomobrya bicolor
- Entomobrya confusa
- Entomobrya griseolivata
- Entomobrya intermedia
- Entomobrya nivalis
- Entomobrya troglodytes G2G3 CO, SD
- Entomobryoides purpurascens Springtail
- Ephemera simulans Brown Drake
- Ephippiochthonius tetrachelatus Dimple-Clawed Chthonid
- Ephippiochthonius virginicus
- Epicharis rustica
- Epitedia cavernicola
- Epitedia wenmanni Deermice Flea
- Eptesicus fuscus Big Brown Bat
- Equus caballus Domestic Horse
- Erebomaster flavescens Golden Cave Harvestman
- Ereboporus naturaconservatus Nature Conservancy Diving Beetle GNR TX
- Eremidrilus allegheniensis G1G2 TN
- Eremidrilus coyote CA
- Eremidrilus elegans CA
- Eremidrilus felini CA
- Eremidrilus parvitheca TX
- Eremidrilus ritocsi CA
- Eremidrilus samacos TX
- Erethizon dorsatum
- Ergodesmus remingtoni G3 IL
- Erichsonius nanus
- Erichsonius patella Kneecap Rove Beetle
- Erigone autumnalis Autumn Money Spider
- Erigone infernalis
- Erigone stygius G1G2 HI
- Erpobdella dubia
- Erpobdella microstoma
- Etheostoma artesiae Redspot Darter
- Etheostoma caeruleum Rainbow Darter
- Etheostoma duryi Black Darter
- Etheostoma flabellare Fantail Darter
- Etheostoma swaini Gulf Darter
- Ethopolys bipunctatus
- Euborellia annulipes Ring-Legged Earwig
- Euborellia antoni
- Eucyclops agilis
- Eucyclops bondi
- Eucyclops elegans
- Eucyclops speratus Fintagghalehops
- Euglandina rosea Rosy Predator Snail
- Euglesa casertana Caserta Pea Mussel
- Euhadenoecus fragilis Tawneys Cave Cricket
- Euhadenoecus insolitus Highland Rim Crevice Cricket
- Euhadenoecus puteanus Allegheny Crevice Cricket
- Eupeodes volucris Large-Tailed Aphideater
- Eurycea bislineata
- Eurycea braggi Southern Grotto Salamander GNR AR, MO
- Eurycea chisholmensis Salado Salamander
- Eurycea cirrigera Southern Two-Lined Salamander
- Eurycea guttolineata Three-Lined Salamander
- Eurycea longicauda Long-Tailed Salamander
- Eurycea lucifuga Cave Salamander
- Eurycea melanopleura Dark-Sided Salamander
- Eurycea multiplicata Many-Ribbed Salamander
- Eurycea nerea Northern Grotto Salamander GNR AR, KS, MO
- Eurycea pterophila Fern Bank Salamander
- Eurycea rathbuni Texas Blind Salamander G1 TX
- Eurycea robusta Blanco Blind Salamander G1 TX
- Eurycea spelaea Western Grotto Salamander G4 AR, KS, MO, MT, OK
- Eurycea tonkawae Jollyville Plateau Salamander G2 TX
- Eurycea tridentifera Comal Blind Salamander G3 TX
- Eurycea wallacei Georgia Blind Salamander G1G2 FL, GA
- Eurycea waterlooensis Austin Blind Salamander G1 TX
- Eurycea wilderae Blue Ridge Two-Lined Salamander
- Euryurus erythropygos
- Euryurus evides
- Euryurus leachii Log Lurker
- Euschoengastia pipistrelli
- Euschoengastia staffordi
- Eustala anastera Orb Weaver
- Eustilicus condei
- Eutrichota affinis
- Eutrichota lipsia
- Eutrombicula alfreddugesi
- Exechia attrita
- Exechia auxiliaria
- Exechia bifurcata
- Exechia obediens
- Exechia shawi
- Exechia umbratica
- Exechiopsis nugax
- Faiditus cancellatus
- Faxonius neglectus Ringed Crayfish
- Faxonius rusticus Rusty Crayfish
- Faxonius stygocaneyi Caney Mountain Cave Crayfish G1 MO
- Faxonius validus Powerful Crayfish
- Faxonius virilis Virile Crayfish
- Felis rufus
- Feralia jocosa Jocose Sallow
- Fissilicreagris imperialis Empire Cave Pseudoscorpion G1 CA
- Flabellorhagidia pecki G1G2 ID
- Folsomia bisetosa
- Folsomia candida Springtail
- Folsomia elongata
- Folsomia fimetaria Springtail
- Folsomia nivalis
- Folsomia penicula
- Folsomia prima
- Folsomia stella Springtail
- Folsomia variabilis
- Folsomides americanus
- Fontigens aldrichi Hoosier Springsnail
- Fontigens antroecetes Enigmatic ghostsnail G2 IL, MO
- Fontigens bottimeri Appalachian Springsnail G2G3 DC, MD, MO, VA
- Fontigens cryptica Hidden springsnail G1 IN, KY
- Fontigens morrisoni Virginia springsnail G2 VA
- Fontigens orolibas Blue Ridge Springsnail
- Fontigens proserpina Proserpine Springsnail G1 MO
- Fontigens tartarea Organ cavesnail G2 MD, VA, WV
- Fontigens turritella Greenbrier Cavesnail G1 WV
- Forbesichthys agassizii Spring Cavefish
- Forbesichthys papilliferus
- Forcipomyia pholetor HI
- Foveacheles auricularia CA
- Foveacheles goffi G1G2 HI
- Foveacheles tenorioae G1G2 HI
- Foveacheles titanica G2G3 CA
- Foveacheles tuktoyaktukensis
- Friesea claviseta Bark-Tretornspringhale
- Fumonelix wetherbyi Clifty Covert
- Fundulus notatus Blackstripe Topminnow
- Gabrius microphthalmus
- Gaeolaelaps queenslandicus
- Galba modicella Rock Fossaria
- Galerita bicolor
- Galerita lecontei
- Gallus gallus Red Junglefowl
- Galumna alata Mite G1G2 KY
- Gambusia affinis Western Mosquitofish
- Gambusia holbrooki Eastern Mosquitofish
- Gammarus acherondytes Illinois Cave Amphipod G2G3 IL
- Gammarus cohabitus G1G2 PA
- Gammarus limnaeus
- Gammarus minus
- Gammarus minus tenuipes VA, WV
- Gammarus pseudolimnaeus Northern Spring Amphipod
- Gammarus troglophilus
- Gastrellarius honestus
- Gastrocopta abbreviata Plains Snaggletooth
- Gastrocopta armifera Armed Snaggletooth
- Gastrocopta contracta Bottleneck Snaggletooth
- Gastrocopta pentodon Comb Snaggletooth
- Gastrocopta similis Great Lakes Snaggletooth
- Gastrodonta interna Brown Bellytooth
- Gastrophryne carolinensis Eastern Narrow-Mouthed Toad
- Gastrophryne olivacea Great Plains Narrow-Mouthed Toad
- Gaucelmus augustinus
- Gaucelmus cavernicola
- Gaucelmus strinatii
- Gaucelmus tropicus
- Gennadota puberula
- Geocentrophora cavernicola G2 KY, VA, WV
- Geocolus caecus
- Geodromicus brunneus
- Geomys bursarius Plains Pocket Gopher
- Girardia dorotocephala Flatworm
- Glacicavicola bathyscioides G3 ID, WY
- Globocreagris nigrescens
- Glyphyalinia carolinensis Spiral Mountain Glyph
- Glyphyalinia cryptomphala Thin Glyph
- Glyphyalinia indentata Carved Glyph
- Glyphyalinia latebricola Stone Glyph
- Glyphyalinia lewisiana Pale Glyph
- Glyphyalinia luticola Furrowed Glyph
- Glyphyalinia pecki Blind Glyph G1G2 AL
- Glyphyalinia praecox Brilliant Glyph
- Glyphyalinia rhoadsi Sculpted Glyph
- Glyphyalinia sculptilis Suborb Glyph
- Glyphyalinia specus Hollow glyph G4 AL, GA, KY, TN, WV
- Glyphyalinia wheatleyi Bright Glyph
- Gnathonaroides pedalis
- Gnophomyia tristissima
- Gopherus polyphemus Gopher Tortoise
- Gordionus lineatus
- Grandidierella palama HI
- Gymnophora luteiventris
- Gyraulus circumstrianis
- Gyraulus parvus Ash Gyro
- Gyrinophilus gulolineatus Berry cave salamander G1 TN
- Gyrinophilus palleucus Tennessee Cave Salamander G2G3 AL, GA, TN
- Gyrinophilus porphyriticus Spring Salamander
- Gyrinophilus subterraneus West Virginia Spring Salamander G1 WV
- Hadenoecus barri Barr's Cave Cricket
- Hadenoecus cumberlandicus Cumberland Cave Cricket
- Hadenoecus jonesi Limrock Blowing Cave Cricket
- Hadenoecus opilionoides
- Hadenoecus subterraneus Mammoth Cave Cricket
- Haideoporus texanus Edwards Aquifer Diving Beetle G1G2 TX
- Halocaridina palahemo G1 HI
- Halocaridina rubra G3 HI
- Hamohalacarus subterraneus Donaldson's Cave Water Mite G1 IN
- Haplophthalmus danicus Spurred Ridgeback
- Haplotaxis brinkhursti G1 WV
- Haplotaxis gordioides Haplotaxid Worm
- Haplotrema concavum Gray-Foot Lancetooth
- Harpalus pennsylvanicus
- Hawaiia minuscula Minute Gem
- Hawaiioscia micropthalma G1G2 HI
- Hawaiioscia paeninsulae G1G2 HI
- Hawaiioscia parvituberculata G1G2 HI
- Hawaiioscia rotundata G1G2 HI
- Hawinella lava G2G3 HI
- Heleomyza brachypterna
- Heleomyza serrata
- Helicina orbiculata
- Helicodiscus barri Raccoon coil G3G4 AL, GA, TN
- Helicodiscus fimbriatus Fringed Coil
- Helicodiscus hadenoceus
- Helicodiscus hadenoecus Cricket Coil
- Helicodiscus inermis
- Helicodiscus multidens Twilight Coil
- Helicodiscus notius Tight Coil
- Helicodiscus notius specus Hollow Coil G2 AL, GA, IL, KY, MO, TN
- Helicodiscus parallelus Compound Coil
- Helicodiscus punctatellus
- Helicodiscus shimeki Temperate Coil
- Helius flavipes
- Helodrilus foetidus
- Helodrilus tenuis
- Hemidactylium scutatum Four-Toed Salamander
- Heminothrus targionii
- Hemiscolopendra marginata Eastern Bark Centipede
- Hemisotoma thermophila
- Hemitremia flammea Flame Chub
- Hentziectypus globosus Fingered Cobweaver
- Hesperochernes bradybaughi GNR AZ
- Hesperochernes holsingeri Holsinger's Cave Pseudoscorpion G1 IN
- Hesperochernes mirabilis Southeastern Cave Pseudoscorpion G5 AL, GA, IL, IN, KY, OH, TN, VA
- Hesperochernes occidentalis Guano Pseudoscorpion G5 AR, MO, OK, TX
- Hesperonemastoma inops G1G2 KY
- Hesperonemastoma pallidimaculosum G3 AL
- Hesperonemastoma smilax GNR WV
- Heteraphorura subtenuis
- Heterelmis comalensis Comal Springs Riffle Beetle
- Heteromurus nitidus
- Hexabathynella hessleri CA
- Hexabathynella muliebris CA
- Hexabathynella otayana CA
- Hexabathynella virginiae VA
- Hibana gracilis Garden Ghost Spider
- Hickmania troglodytes Tasmanian Cave Spider
- Hirundo rustica Barn Swallow
- Hobbsinella edwardensis GNR TX
- Hobbsinella gunnisonensis CO
- Hogna frondicola Forest Wolf Spider
- Holsingeria unthanksensis Thankless ghostsnail G2 VA, WV
- Holsingerius samacos G1G2 TX
- Homaeotarsus bicolor
- Homaeotarsus carolinus
- Homidia socia Three-Lined Springtail
- Horologion hubbardi GNR VA
- Horologion speokites Arbuckle Cave Beetle GH WV
- Horreolanus orphanus IL, OH
- Howaia mogera Kasholenspin
- Hubbardia shoshonensis Shoshone Cave Whipscorpion G1 CA
- Hyalella azteca Mexican Freshwater Shrimp
- Hyalella cretae GNR NV
- Hygrotus sayi Say's Diving Beetle
- Hylarana grandocula Big-Eyed Frog
- Hypena scabra Green Cloverworm
- Hypentelium nigricans Northern Hog Sucker
- Hypoaspis angusta
- Hypochilus bonneti
- Hypochilus coylei
- Hypochilus gertschi
- Hypochilus pococki Pocock's Lampshade-Web Spider
- Hypochilus thorelli Thorell's Lampshade-Web Spider
- Hypogastrura antra
- Hypogastrura assimilis Mark-Tornspringhale
- Hypogastrura matura
- Hypogastrura notha
- Hypogastrura purpurescens Purpur-Tornspringhale
- Hypogastrura sparta
- Hypogastrura tullbergi
- Ictalurus punctatus Channel Catfish
- Ictidomys tridecemlineatus Thirteen-Lined Ground Squirrel
- Ictiobus bubalus Smallmouth Buffalo
- Idagona jasperi UT
- Idagona lehmanensis NV
- Idagona westcotti Idaho Lave Tube Millipede G1G2 ID
- Illacme tobini CA
- Inflectarius inflectus Shagreen
- Inflectarius rugeli Deep-Tooth Shagreen
- Iolania frankanstonei HI
- Islandiana cavealis Cave Sheet-web Spider GNR IN
- Islandiana flaveola Unequal Whiskered Money Spider
- Islandiana lewisi cave sheet-web spider G1 IN
- Islandiana muma G1G2 AL, IL, VA
- Islandiana princeps Eastern Whiskered Money Spider
- Islandiana speophila Cavern Sheet-web Spider G1 WV
- Islandiana unicornis G2G3 IL, OK, TX
- Isotoma andrei
- Isotoma gelida
- Isotoma tariva
- Isotoma trispinata
- Isotoma viridis Engspringhale
- Isotomiella minor Springtail
- Ixodes conepati
- Ixodes cookei American Castor Bean Tick
- Ixodes scapularis Black Legged Tick
- Ixodes woodi
- Jalysus wickhami Spined Stilt Bug
- Karschomyia viburni
- Kenkia glandulosa Pink Cave Flatworm G2G3 IA, MO
- Kenkia lewisi Lewis' cave planarian G1 IL, MO
- Kenkia rhynchida Malheur Cave Flatworm G1G2 OR
- Kleptochthonius affinis G1G2 TN
- Kleptochthonius anophthalmus G1 VA
- Kleptochthonius attenuatus G1 KY
- Kleptochthonius barri G1G2 TN
- Kleptochthonius binoculatus G1G2 VA
- Kleptochthonius cerberus G1 KY
- Kleptochthonius charon G1G2 TN
- Kleptochthonius daemonius G1G2 TN
- Kleptochthonius erebicus G1 KY
- Kleptochthonius gertschi Gertsch's Cave Pseudoscorpion G1 VA
- Kleptochthonius griseomanus Gray-handed Cave Pseudoscorpion G2 IN
- Kleptochthonius hageni G1G2 KY
- Kleptochthonius henroti Greenbrier Valley Cave Pseudoscorpion G2 WV
- Kleptochthonius hetricki Organ Cave Pseudoscorpion G1 WV
- Kleptochthonius hubrichti G1G2 KY
- Kleptochthonius infernalis G1 TN
- Kleptochthonius krekeleri G2G4 KY
- Kleptochthonius lewisorum Lewis Cave Pseudoscorpion G1 IN
- Kleptochthonius lutzi Lutz's Cave Pseudoscorpion G1 VA
- Kleptochthonius magnus G1 GA, TN
- Kleptochthonius microphthalmus G1G2 KY
- Kleptochthonius multispinosus
- Kleptochthonius myopius G1 TN
- Kleptochthonius orpheus Orpheus Cave Pseudoscorpion G1 WV
- Kleptochthonius packardi Packard's Cave Pseudoscorpion G2 IN, KY
- Kleptochthonius pluto G1 TN
- Kleptochthonius proserpinae Proserpina Cave Pseudoscorpion G1 WV
- Kleptochthonius proximosetus G1 VA
- Kleptochthonius regulus G1G2 VA
- Kleptochthonius rex G1 TN
- Kleptochthonius similis G1 VA
- Kleptochthonius stygius G1 TN
- Kleptochthonius tantalus G1 TN
- Komarekiona eatoni Kentucky Earthworm
- Labidostomma neotropica
- Laccophilus maculosus Dingy Diver
- Lacrimacandona wisei GNR TX
- Lacunicambarus diogenes Devil Crawfish
- Ladislavella elodes Marsh Pondsnail
- Laelaps cavernicola KY
- Lampetra aepyptera Least Brook Lamprey
- Lampropeltis holbrooki Speckled Kingsnake
- Larca aalbui Aalbu's Cave Pseudoscorpion G1 CA
- Larca cavicola Grand Canyon Cave Pseudoscorpion G1G2 AZ
- Larca guadalupensis Guadalupe Cave Pseudoscorpion G1G2 TX
- Larca laceyi Lacey's Cave Pseudoscorpion G1 CA
- Larca welbourni G1G2 AZ
- Lascoria ambigualis Ambiguous Moth
- Lasionycteris noctivagans Black Bat
- Lasiurus borealis Eastern Red Bat
- Lasiurus cinereus
- Lasiurus seminolus Seminole Bat
- Latrodectus variolus Northern Black Widow
- Lebia ornata Ornate Harp Ground Beetle
- Leia cuneola
- Leiobunum aldrichi Aldrich's Harvestman
- Leiobunum bicolor
- Leiobunum calcar
- Leiobunum longipes
- Leiobunum nigripes
- Leiobunum politum
- Leiobunum townsendii
- Leiobunum vittatum Eastern Harvestman
- Lepidocyrtus atropurpureus
- Lepidocyrtus helenae
- Lepidocyrtus paradoxus
- Lepidocyrtus usitatus
- Lepomis auritus Redbreast Sunfish
- Lepomis cyanellus Green Sunfish
- Lepomis gulosus Warmouth
- Lepomis humilis Orangespotted Sunfish
- Lepomis macrochirus Bluegill
- Lepomis megalotis Mojarra De Cuatro Cienegas
- Lepomis microlophus Redear Sunfish
- Lepthyphantes leprosus Household Fine Sheetweaver
- Leptocera atra
- Leptocera caenosa
- Leptopeza compta
- Leptotrombidium myotis
- Lepus americanus Snowshoe Hare
- Lesteva cribratula
- Lesteva pallipes
- Lestodiplosis grassator
- Lestodiplosis satiata
- Lethemurus missus Missus Cave Springtail G4 CO, IL, IN, KY, MO, Mexico, TN
- Leucauge venusta Orchard Orbweaver
- Leucohya heteropoda
- Leucohya texana G1G2 TX
- Leydigia leydigi Gewone Breedstaartwatervlo
- Liagoceradocus lonomaka G1G2 HI
- Liancalus genualis
- Ligidium elrodii
- Ligidium kofoidi G1G2 CA
- Limomyza cavernicola
- Limonia annulata Syyssienikiekko
- Limonia badia
- Limonia indigena
- Limonia maculicosta
- Limonia stulta
- Linopodes mammouthia KS, KY
- Liocranoides archeri Archer's Two-clawed Cave Spider G2 AL, TN
- Liocranoides coylei
- Liocranoides tennesseensis
- Liocranoides unicolor GU AL, GA, KY, TN
- Liposcelis decolor Book Louse
- Liposcelis divinatoria
- Lirceolus bisetus G1G2 TX
- Lirceolus cocytus GNR TX
- Lirceolus hardeni G2G3 TX
- Lirceolus nidulus GNR Mexico, TX
- Lirceolus pilus G2G3 TX
- Lirceolus smithii Texas Troglobitic Water Slater G1G2 TX
- Lirceus bicuspidatus
- Lirceus bidentatus
- Lirceus bisetus VA
- Lirceus culveri Rye Cove Cave Isopod G1 VA
- Lirceus fontanalis
- Lirceus fontinalis Lower Ohio Waterslater
- Lirceus garmani
- Lirceus holsingeri VA
- Lirceus hoppinae Blunt-Toothed Springslater
- Lirceus littonensis VA
- Lirceus orndorffi VA
- Lirceus ozarkensis
- Lirceus slayorum Flat Waterslaters
- Lirceus usdagalun Lee County Cave Isopod G1 VA
- Lirceus zigleri Flat Waterslaters GNR VA
- Lissocreagris eurydice G1 AL
- Lissocreagris nickajackensis G1G2 AL, TN
- Lissocreagris persephone G1 AL
- Lissocreagris pluto G1 AL
- Lissocreagris subatlantica
- Lissocreagris valentinei Valentine's Cave Pseudoscorpion G1 VA
- Litargus balteatus Stored Grain Hairy Fungus Beetle
- Lithasia obovata Shawnee Rocksnail
- Lithobates catesbeianus American Bullfrog
- Lithobates clamitans Green Frog
- Lithobates grylio
- Lithobates heckscheri
- Lithobates palustris Pickerel Frog
- Lithobates sphenocephalus Southern Leopard Frog
- Lithobates sylvaticus
- Lithobius atkinsoni
- Litocampa cookei Cooke's Cave Dipluran G5 AL, GA, KY, TN, VA
- Litocampa fieldingae Fielding's Cave Dipluran G2G3 VA, WV
- Litocampa henroti G1G2 AL
- Litocampa hoffmani G3 VA
- Litocampa jonesi G2G3 KY, TN
- Litocampa pucketti Puckett's Cave Dipluran G1G2 VA
- Litocampa valentinei G5 AL, TN
- Lobosculum pustuloides Tiny Liptooth
- Lontra canadensis Common Otter
- Lophomus skamania WA
- Loxosceles panama Violin Spiders
- Lucilla inermis Oldfield Coil
- Lucilla singleyana Singley's Subterranean Discus Snail
- Lumbricus rubellus Blood Worm
- Lumbricus terrestris Nightcrawler
- Lustrochernes minor
- Luxilus chrysocephalus Striped Shiner
- Lycosa howarthi G1G2 HI
- Lymantes nadineae GNR TX
- Lynx rufus Bobcat
- Lyogyrus retromargo Indented Duskysnail
- Lythrurus fasciolaris Scarlet Shiner
- Machilis variabilis
- Macrobrachium carcinus Bigclaw River Shrimp
- Macrocera hirsuta
- Macrocera nobilis
- Macrocheles penicilliger
- Macrocheles robustulus Mite
- Macrocheles stygius G1G2 KY
- Macrocheles troglodytes G1G2 KY
- Macrocyclops albidus White Copepod
- Macrocyclops fuscus Giant Copepod
- Macromastus umpqua G1G2 OR
- Maevia inclemens Dimorphic Jumper
- Malaconothrus monodactylus
- Mangora placida Tuftlegged Orbweaver
- Manota obscura
- Margarinotus egregius
- Marmota monax Groundhog
- Marpissa lineata Four-Lined Slender Jumping Spider
- Marstonia comalensis Comal Marstonia
- Marstonia ogmorhaphe Royal Marstonia
- Martes americana American Marten
- Mastigoproctus giganteus Giant Vinegaroon
- Maymena ambita
- Mecyclothorax aa HI
- Mecynogea lemniscata Basilica Orbweaver
- Megacyclops donnaldsoni Donaldson's Cave Copepod G3G4 GA, IN, KY, TN
- Megacyclops latipes
- Megacyclops viridis Cyclopoid Copepod
- Megalonyx jeffersonii
- Megalothorax minimus
- Megalothorax tristani
- Megapallifera mutabilis Changeable Mantleslug
- Megascops asio Eastern Screech Owl
- Megaselia breviterga
- Megaselia cavernicola
- Megaselia nigriceps
- Megaselia rufipes Hump-Backed Fly
- Megaselia spelunciphila
- Megaselia taylori
- Melanoides tuberculata
- Melanolestes picipes Black Corsair
- Mephitis mephitis Striped Skunk
- Mermessus antraeus
- Mermessus denticulatus Amerikaanse Kasdwergspin
- Mermessus indicabilis
- Mermessus maculatus Sheet-Web Spiders
- Mermessus tridentatus Spider
- Meropelopia flavifrons
- Mesaphorura iowensis
- Mesaphorura krausbaueri
- Mesaphorura pacifica
- Mesaphorura silvicola
- Mesocyclops edax
- Mesodon clausus Yellow Globelet
- Mesodon thyroidus White-Lip Globe
- Mesodon zaletus Toothed Globe
- Mesomphix andrewsae Mountain Button
- Mesomphix anurus Frog Button
- Mesomphix capnodes Dusky Button
- Mesomphix cupreus Copper Button
- Mesomphix perlaevis Smooth Button
- Mesomphix pilsbryi Striate Button
- Meta ovalis Cave Orb Weaver
- Metajapyx subterraneus
- Metalimnobia cinctipes
- Metaltella simoni Hacklemesh Weaver
- Metisotoma grandiceps
- Mexichthonius exoticus G1G2 TN
- Mexistenasellus coahuila Coahuila Groundwater Isopod G2G3 Mexico, TX
- Mexistenasellus floridensis Florida Cave Isopod G1 FL
- Mexiweckelia hardeni G2G3 TX
- Microbisium parvulum
- Microcreagris grandis Great Basin Cave Pseudoscorpion G1G2 NV
- Microcyclops rubellus
- Microcylloepus pusillus
- Microplana atrocyaneus
- Micropogonias undulatus Croaker
- Micropterus dolomieu Smallmouth Bass
- Micropterus punctulatus Spotted Bass
- Micropterus salmoides American Black Bass
- Microtus ochrogaster Prairie Vole
- Microtus pennsylvanicus Meadow Vole
- Microtus pinetorum Pine Vole
- Microtus xanthognathus Taiga Vole
- Microvelia americana
- Miktoniscus barri Barr's Terrestrial Cave Isopod G2G4 IN, KY, TN
- Miktoniscus linearis
- Miktoniscus medcofi Small Alabama Sowbug
- Miktoniscus morganensis
- Miktoniscus oklahomensis Racovitza's Cave Isopod G1G2 OK
- Miktoniscus racovitzai Racovitza's Terrestrial Cave Isopod G3G4 KY, OK, VA
- Mimetus notius Reticulated Pirate Spider
- Mimetus puritanus Common Pirate Spider
- Minicreagris pumila
- Mixojapyx reddelli G3G4 TX
- Mochlonyx cinctipes
- Molothrus ater Brown-Headed Cowbird
- Monopis crocicapitella Bird Nest Moth
- Monopsyllus wagneri
- Montanabathynella pecosensis TX
- Montanabathynella salish GNR MT
- Moraria cristata
- Mormoops megalophylla Ghost-Faced Bat
- Morone saxatilis Maryland Bass Hybrid
- Moxostoma erythrurum Golden Redhorse
- Mundochthonius cavernicola G1G2 IL, MO
- Mundochthonius holsingeri G1 VA
- Mus musculus House Mouse
- Musca domestica Common House Fly
- Muscina prolapsa Muscoid Fly
- Musculium securis
- Mustela nivalis Least Weasel
- Mycetophila analis
- Mycetophila byersi
- Mycetophila fisherae
- Mycetophila ichneumonea
- Mycetophila ruficollis
- Mycetophila sordida
- Mycomya nitida
- Mylohyus nasutus
- Myodopsylla insignis Bat Flea
- Myotis austroriparius Southeastern Myotis
- Myotis grisescens Gray Bat
- Myotis leibii Eastern Small-Footed Bat
- Myotis lucifugus Little Brown Bat
- Myotis septentrionalis Northern Bat
- Myotis sodalis Cluster Bat
- Myotis velifer Cave Myotis
- Myrmecina americana American Mite-Eating Ant
- Mystacides sepulchralis Black Dancer Caddisfly
- Myzobdella reducta
- Nadabius ameles
- Nais variabilis Aquatic Oligochaete Worm
- Namiotkocypria haysensis TX
- Nampabius mycophor
- Nampabius turbator G1 VA
- Nanhermannia nanus
- Nannopetalum fontis AL
- Nannopetalum vespertilo NC
- Narceus americanus American Giant Millipede
- Narceus annularis
- Neanura hawaiiensis G1G2 HI
- Neanura muscorum Moss Springtail
- Neanura persimilis
- Neanura pseudoquadrioculata
- Neaphaenops tellkampfi G3G4 IN, KY
- Necrophilus pettitii
- Neelides minutus
- Neglecandona neglecta
- Nelima elegans
- Nelima paessleri Aggregating Harvestman
- Nelsonites jonesi G2G3 KY
- Nelsonites walteri G3 TN
- Nemadus hornii
- Nemoura trispinosa
- Neoallochernes incertus G1G2 NM
- Neoallochernes stercoreus G4 TX
- Neobisnius paederoides
- Neochthonius imperialis Empire Cave Pseudoscorpion G1 CA
- Neochthonius troglodytes G2G3 CA
- Neoechinorhynchus cylindratus
- Neogale vison American Mink
- Neohelix albolabris Eastern Whitelip
- Neolithobius voracior
- Neoporus clypealis
- Neoscona domiciliorum Red-Femured Spotted Orbweaver
- Neospintharus trigonum Horned Parasitic Cobweaver
- Neotoma floridana Eastern Woodrat
- Neotoma magister Allegheny Woodrat
- Nepalomyia sombrea
- Neriene radiata Filmy Dome Spider
- Nerodia erythrogaster Plain-Bellied Water Snake
- Nerodia fasciata Southern Water Snake
- Nerodia sipedon Common Watersnake
- Nesidiolestes ana Ana Wingless Thread Bug G1G2 HI
- Nesticus barri Barr's Cave Spider G3 AL, TN
- Nesticus barrowsi G1G2 TN
- Nesticus brimleyi G1G2 NC
- Nesticus carolinensis Linville Caverns Spider
- Nesticus carteri Carter's Cave Spider
- Nesticus cressleri GNR GA
- Nesticus dilutus Grassy Creek Cave Spider G1 TN
- Nesticus furtivus Racoon Mountain Caverns Cave Spider G1 TN
- Nesticus georgia Georgia Cave Spider G1G2 GA
- Nesticus gertschi
- Nesticus holsingeri Holsinger's Cave Spider G3G4 VA
- Nesticus jonesi Cave Spring Cave Spider G1 AL
- Nesticus lula GNR GA
- Nesticus mimus
- Nesticus paynei G3G4 TN, VA
- Nesticus pecki Monteagle Cave Spider GNR TN
- Nesticus potterius G1G2 CA
- Nesticus reclusus Lost Nantahala Cave Spider
- Nesticus sodanus
- Nesticus stupkai
- Nesticus stygius G1G2 TN
- Nesticus tennesseensis Tennessee Cave Spider G3G4 TN, VA, WV
- Neuratelia sayi
- Nevadesmus hubbsi GNR NV
- Nevadesmus ophimontis NV
- Nevadesmus superstitiona AZ
- Niptus arcanus CA
- Nitidotachinus scrutator
- Nitocrellopsis texana GNR TX
- Nopoiulus kochii Haakwang
- Notemigonus crysoleucas Golden Shiner
- Notiobia terminata
- Notophthalmus viridescens Eastern Newt
- Notropis atherinoides Emerald Shiner
- Novobisium carolinense
- Novobisium ingratum
- Nycteridopsylla chapini
- Nycticeius humeralis Evening Bat
- Nyctinomops femorosaccus Pocketed Free-Tailed Bat
- Oaphantes prometheus CA
- Occasjapyx kofoidi CA
- Ochrotrichia spinosa
- Ocrepeira ectypa
- Octolasion lacteum White Worm
- Octolasion tyraeum
- Octolasion tyrtaeum Woodland White Worm
- Odiellus pictus Painted Harvestman
- Odocoileus virginianus White-Tailed Deer
- Odontotaenius disjunctus Patent Leather Beetle
- Oecothea fenestralis
- Oecothea specus Small Cave Sun Fly
- Oedipodrilus macbaini
- Oliarus gagneri G1G2 HI
- Oliarus kalaupapae G1G2 HI
- Oliarus lorettae G1G2 HI
- Oliarus makaiki G1G2 HI
- Oliarus polyphemus G1G2 HI
- Oliarus priola G1G2 HI
- Oliarus waikau G1G2 HI
- Omalium rivulare Ocillate Rove Beetle
- Omorgus alatus
- Omorgus amictus
- Omorgus batesi
- Omorgus brucki
- Omorgus carinatus
- Omorgus costatus
- Omorgus fuliginosus
- Omorgus lindemannae
- Omorgus punctatus
- Omorgus rubricans
- Omorgus suberosus Hide Beetle
- Oncopodura cruciata G1G2 MT
- Oncopodura fenestra G2G3 TX
- Oncopodura hoffi Hoff's Cave Springtail G1G2 MO
- Oncopodura hubbardi G2 VA
- Oncopodura iowae G3G4 IA, IL, MO
- Oncopodura mala Malheur Cave Springtail
- Oncopodura prietoi G1G2 Mexico, NM
- Oncopodura subhoffi G3 CO
- Oniscus asellus Common Shiny Woodlouse
- Onychiurus eous
- Onychiurus gelus G2G3 IA, WA, WI
- Onychiurus janus G2G3 AL, VA, WV
- Onychiurus obesus G3G4 IA, MN, MO, WI
- Onychiurus opus
- Onychiurus oregonensis G1G2 OR
- Onychiurus paro G1 AL
- Onychiurus parvicornis
- Onychiurus pipistrellae IL
- Onychiurus pseudoarmatus
- Onychiurus pseudofimetarius
- Onychiurus relcutus
- Onychiurus reluctus GNR IA, IL, Mexico, TN, WV
- Onychiurus similis
- Opheodrys aestivus Greensnake
- Ophisaurus ventralis Eastern Glass Lizard
- Ophyiulus pilosus Furry Snake Millipede
- Opiona catorycha OR
- Opiona graeningi CA
- Oppia nitens
- Orchesella ainsiiei
- Orchesella hexfasciata
- Orchopeas leucopus Pulga
- Orchopeas sexdentatus
- Orconectes australis Southern Cave Crayfish G5 AL, KY, TN
- Orconectes barri Cumberland Plateau Cave Crayfish G2 KY, TN
- Orconectes incomptus Tennessee Cave Crayfish G2 TN
- Orconectes inermis Ghost Crayfish G5 IN, KY, TN
- Orconectes packardi Appalachian Cave Crayfish G2 KY, TN
- Orconectes pellucidus Mammoth Cave Crayfish G4 AL, IN, KY, TN
- Oregonasellus elliotti OR
- Oreonetides beattyi Beatty's Sheetweb Cave Spider GNR IN, MD, PA, TN, VA
- Oreonetides vaginatus Undergrowth Sheet-Web Weaver
- Oreophantes recurvatus
- Orfelia elegans
- Origanates rostratus
- Ormosia affinis Cranefly
- Ormosia meigenii
- Oropsylla arctomys
- Orthocyclops modestus
- Orus rubens
- Oryzaephilus surinamensis Sawtoothed Grain Beetle
- Osphranticum labronectum
- Osteopilus septentrionalis Cuban Treefrog
- Otiorhynchus ovatus Strawberry Root Weevil
- Otostigmus cooperi
- Oxidus gracilis Greenhouse Millipede
- Oxyopes salticus Lynx Spider
- Oxytelus exiguus
- Ozarkia alabama GNR AL
- Ozarkia arkansa AR
- Ozarkia blanda GNR AL
- Ozarkia georgia GNR GA
- Ozarkia novaegalleciae NM
- Ozarkia serena G1G2 AL
- Pachydesmus crassicutis
- Pacificabathynella kalispellensis GNR MT
- Pacificabathynella ruthae GNR MT
- Pacificabathynella sequoiae GNR CA, WA
- Pacificabathynella stanfordi GNR MT
- Pacificabathynella yupik AK
- Packardesmus cavicola
- Paeromopus cavicolens
- Paitobius arienus
- Paitobius carolinae
- Paitobius juventus
- Palaemon kadiakensis Mississippi Grass Shrimp
- Palaemon paludosus Eastern Grass Shrimp
- Palaemonetes antrorum Balcones Cave Shrimp G2G3 TX
- Palaemonetes cummingi Squirrel Chimney Cave Shrimp GH FL
- Palaemonias alabamae Alabama Cave Shrimp G1 AL
- Palaemonias ganteri Mammoth Cave Shrimp G1 KY
- Paleonura petebellingeri G1 VA
- Pangaeus docilis
- Panstrongylus geniculatus Barbeiro
- Pantelozetes cavaticus
- Pantherophis guttatus Corn Snake
- Pantherophis obsoletus Pilot Black Snake
- Pantherophis quadrivittatus Yellow Rat Snake (Quadrivittata)
- Pantherophis spiloides Gray Rat Snake
- Parabogidiella americana G2G3 TX
- Paracarpais niveus
- Paracyclops canadensis
- Paracyclops chiltoni
- Paracyclops poppei Copepod
- Paragnetina media Embossed Stone
- Paraholsingerius smaragdinus GNR TX
- Parametriocnemus lundbeckii
- Paramexiweckelia ruffoi Ruffo's Cave Amphipod G1G2 TX
- Paramoera lokowai G1G2 HI
- Paramoera paakai G1G2 HI
- Paramoera rua G1G2 HI
- Paraplanaria occulta
- Pararhynchelmis texana TX
- Parascalops breweri Brewer's Mole
- Parasitus fimetorum
- Parasitus remberti
- Parasteatoda tepidariorum Common House Spider
- Paratachys aaa HI
- Paratheridula perniciosa Cobweb Spiders
- Paravachonium bolivari
- Paravitrea capsella
- Paravitrea multidentata Dentate Supercoil
- Parazaona cavicola
- Paria sexnotata Juniper Paria
- Parisotoma notabilis
- Parobisium charlotteae G1G2 OR
- Parobisium petilum CA
- Parobisium yosemite CA
- Parvidrilus strayeri G1G2 AL
- Patera appressa Flat Bladetooth
- Patera laevior Smooth Bladetooth
- Patera perigrapta Engraved Bladetooth
- Patera sargentiana Grand Bladetooth
- Patrobus longicornis Long-Horned Patrobus Beetle
- Pegoplata infirma
- Pelegrina exigua
- Pelegrina proterva Common White-Cheeked Jumping Spider
- Penaeus setiferus Northern White Shrimp
- Percina caprodes Common Logperch
- Percina nigrofasciata Blackbanded Darter
- Percymoorensis lateralis
- Perichaeta minima
- Pericoma scotiae
- Perimyotis subflavus Tricolored Bat
- Periplaneta americana American Cockroach
- Perissopalla flagellisetula
- Peromyscopsylla hesperomys
- Peromyscus attwateri Attwater's Mouse
- Peromyscus boylii Brush Deermouse
- Peromyscus gossypinus Cotton Deermouse
- Peromyscus leucopus White-Footed Deermouse
- Peromyscus maniculatus Deer Mouse
- Perpolita binneyana Blue Glass
- Petrochelidon pyrrhonota American Cliff Swallow
- Phagocata angusta G1 WV
- Phagocata bursaperforata
- Phagocata carolinensis G1G2 NC
- Phagocata gracilis Slender Spring Flatworm
- Phagocata holleri Holler's Cave Flatworm G1G2 NC
- Phagocata morgani
- Phagocata notorchis TN
- Phagocata oregonensis Oregon Cave Flatworm G1G2 OR
- Phagocata procera G1G2 NC
- Phagocata pygmaea NC
- Phagocata spuria NC
- Phalangodes armata G3G4 IN, KY
- Phanetta subterranea Subterranean Sheetweb Spider G5 AL, AR, GA, IL, IN, KY, MO, NC, OH, TN, VA, WV
- Phaonia soccata
- Phelister fulvulus
- Phelister luculentus Escarabajo Payaso
- Phenacomys intermedius Heather Vole
- Pheretima rodericensis
- Phidippus purpuratus Marbled Purple Jumper
- Philomycus carolinianus Carolina Mantleslug
- Philomycus togatus Toga Mantleslug
- Philonthus cyanipennis Staph Beetle
- Philonthus lomatus
- Phoberus capensis
- Phoberus pusillus
- Phoberus sulcatus Grooveneck Keratin Beetle
- Pholcus dade
- Pholcus jusahi
- Pholcus lanieri
- Pholcus phalangioides Cosmopolitan Cellar Spider
- Phoxinus erythrogaster
- Phreatoceras taylori Nymph trumpet G1G2 TX
- Phreatodrobia bulla TX
- Phreatodrobia conica Hueco Cavesnail G1 TX
- Phreatodrobia coronae G1G2 TX
- Phreatodrobia embossa TX
- Phreatodrobia imitata Mimic cavesnail G1 TX
- Phreatodrobia micra Flattened Cavesnail G2G3 AL, TX
- Phreatodrobia nugax Domed Cavesnail G1G2 TX
- Phreatodrobia plana Disc cavesnail G2 TX
- Phreatodrobia punctata High-hat cavesnail G2 TX
- Phreatodrobia rotunda Beaked cavesnail G1G2 TX
- Phreatodrobia spica Spiky Cavesnail GNR TX
- Phronia exigua
- Phronia flavipes
- Phronia incerta
- Phronia sp. A
- Phronia sp. B
- Physella acuta European Physa
- Physella gyrina Tadpole Physa
- Physella spelunca Cave Physa G1 WY
- Physocyclus enaulus
- Physocypria denticulata
- Physocypria globula
- Pimephales promelas Fathead Minnow (Rosy Reds)
- Pimoa altioculata
- Pinodytes pusio
- Pinodytes rothi
- Pirata alachuus
- Pirata sedentarius
- Piratula insularis Lonely Wolf Spider
- Pisaurina mira Nursery Web Spider
- Plathemis lydia Common Whitetail or Long-Tailed Skimmer
- Platygonus compressus
- Platynus angustatus
- Platynus cincticollis
- Platynus parmarginatus
- Platynus tenuicollis Slender Ground Beetle
- Plestiodon fasciatus Common Five-Lined Skink
- Plethodon albagula Western Slimy Salamander
- Plethodon angusticlavius Ozark Salamander
- Plethodon caddoensis Caddo Mountain Salamander
- Plethodon cinereus Eastern Red-Backed Salamander
- Plethodon dorsalis Northern Zigzag Salamander
- Plethodon glutinosus Northern Slimy Salamander
- Plethodon grobmani Southeastern Slimy Salamander
- Plethodon petraeus Pigeon Mountain Salamander
- Plethodon richmondi Ravine Salamander
- Plethodon serratus Southern Red-Backed Salamander
- Plethodon ventralis Southern Zigzag Salamander
- Plethodon websteri Webster's Salamander
- Pleurocera simplex
- Plumatyla humerosa G2G3 CA
- Plutomurus brevimucronata
- Plutomurus californicus G2G3 CA, Mexico
- Plutomurus grahami G1 NM
- Plutomurus oregonensis
- Pnyxia scabiei Potato Scab Gnat
- Poecilochirus carabi
- Poecilophysis extraneostella G2 VA, WV
- Poecilophysis pratensis Mite
- Poecilophysis weyerensis G3 IN, KY, TN, VA, WV
- Pogonognathellus bidentatus
- Pogonognathellus danieli
- Pogonognathellus dubius Ghost Silver Bullet Springtail
- Pogonognathellus flavescens
- Pogonognathellus lamelliferus
- Pogonognathellus nigritus
- Polycentropus barri
- Polycentropus elarus
- Polydesmus inconstans European Sculpted Millipede
- Polydesmus moniliaris
- Polydrusus impressifrons Pale Green Weevil
- Polygonia comma Eastern Comma
- Polynoncus gemmingeri
- Pomatiopsis lapidaria Slender Walker
- Pomoxis nigromaculatus Black Crappie
- Ponera pennsylvanica Common Porthole Ant
- Porcellio laevis Smooth Slater
- Porcellio scaber Common Rough Woodlouse
- Porcellio spinicornis Painted Woodlouse
- Porrhomma cavernicola Appalachian Cave Spider G5 AL, AR, GA, IA, IL, IN, KY, MD, MO, NC, OK, ON, PA, TN, VA, WV
- Porrhomma egeria Kelderkleinoogje
- Porrhomma terrestre Terrestrial Wide-Eyed Sheetweaver
- Potamocypris fulva
- Potamothrix bavaricus Aquatic Oligochaete Worm
- Pratherodesmus despaini CA
- Pratherodesmus ecclesia AZ
- Pratherodesmus voylesi AZ
- Prenolepis imparis American Winter Ant
- Prietella phreatophila Mexican Blindcat GNR Mexico, TX
- Primicimex cavernis
- Prionochaeta opaca Small Carrion Beetle
- Pristiloma subrupicola Southern Tightcoil
- Pristina leidyi Aquatic Oligochaete Worm
- Procambarus acherontis Orlando Cave Crayfish G1 FL
- Procambarus alleni Everglades Crayfish
- Procambarus attiguus Silver Glen Springs Cave Crayfish G1 FL
- Procambarus blandingii Santee Crayfish
- Procambarus clarkii Red Swamp Crayfish
- Procambarus cuevachicae
- Procambarus delicatus Bigcheek Cave Crayfish G1 FL
- Procambarus erythrops Santa Fe Cave Crayfish G1 FL
- Procambarus fallax Slough Crayfish
- Procambarus franzi Orange Lake Cave Crayfish G1 FL
- Procambarus horsti Big Blue Spring Cave Crayfish G1 FL
- Procambarus leitheuseri Coastal Lowland Cave Crayfish G1G2 FL
- Procambarus lucifugus Light-fleeing Cave Crayfish G1G2 FL
- Procambarus milleri Miami Cave Crayfish G1 FL
- Procambarus morrisi Putnum County Cave Crayfish G1 FL
- Procambarus orcinus Woodville Karst Cave Crayfish G1 FL
- Procambarus paeninsulanus Peninsula Crayfish
- Procambarus pallidus Pallid Cave Crayfish G1G2 FL, GA
- Procambarus pilosimanus
- Procambarus spiculifer White Tubercled Crayfish
- Procambarus toltecae Toltecae Crayfish
- Procambarus versutus Sly Crayfish
- Procambarus villalobosi
- Procaris hawaiana G1 HI
- Proceratium micrommatum
- Procladius bellus
- Procyon lotor Common Raccoon
- Progomphus obscurus Common Sanddragon
- Progradungula carraiensis Carrai Cave Spider
- Proisotoma frisoni
- Proisotoma minuta Springtail
- Proisotoma sepulcralis
- Proisotoma veca
- Proisotoma vesiculata
- Prosimulium mixtum Mixed-Up Black Fly
- Prosimulium saltus
- Prostoma graecense
- Proteocephalus poulsoni KY
- Protolimnesia ventriplacophora TX
- Psephenus herricki Herrick's Water Penny Beetle
- Pseudachorutes aureofasciatus
- Pseudachorutes saxatilis
- Pseudachorutes subcrassoides
- Pseudacris crucifer Spring Peeper
- Pseudacris feriarum Southeastern Chorus Frog
- Pseudacris triseriata Striped Chorus Frog
- Pseudanophthalmus abditus Concealed Cave Beetle G3 KY
- Pseudanophthalmus acherontis Echo Cave Beetle G1 TN
- Pseudanophthalmus alabamae Alabama Cave Beetle G2 AL
- Pseudanophthalmus alladini Alladin's Cave Beetle G3G4 AL
- Pseudanophthalmus assimilis West Wills Valley Cave Beetle G1G2 AL
- Pseudanophthalmus audax Bold Cave Beetle G1G2 KY
- Pseudanophthalmus avernus Avernus Cave Beetle G1 VA
- Pseudanophthalmus barberi G2G3 KY
- Pseudanophthalmus barri G1G2 IN
- Pseudanophthalmus beakleyi Beakley's Cave Beetle G3G4 KY, TN
- Pseudanophthalmus bendermani Benderman's Cave Beetle G1G2 TN
- Pseudanophthalmus caecus Clifton Cave Beetle G1 KY
- Pseudanophthalmus calcareus Limestone Cave Beetle G1 KY
- Pseudanophthalmus catherinae Catherine's Cave Beetle G1 TN
- Pseudanophthalmus catoryctos Lesser Adams Cave Beetle G1 KY
- Pseudanophthalmus cerberus G3G4 KY, TN
- Pseudanophthalmus chthonius G3 IN, KY
- Pseudanophthalmus ciliaris G3G4 KY, TN
- Pseudanophthalmus cnephosus Larue County Cave Beetle G1G2 KY
- Pseudanophthalmus colemanensis Coleman Cave Beetle G1 TN
- Pseudanophthalmus conditus Hidden Cave Beetle G1G2 KY
- Pseudanophthalmus cordicollis Little Kennedy Cave Beetle G1 VA
- Pseudanophthalmus cumberlandus G1G2 TN
- Pseudanophthalmus darlingtoni G3 KY
- Pseudanophthalmus deceptivus Deceptive Cave Beetle G1 VA
- Pseudanophthalmus delicatus Delicate Cave Beetle G3G4 TN, VA
- Pseudanophthalmus desertus G3 KY
- Pseudanophthalmus digitus G1G2 GA, TN
- Pseudanophthalmus distinguens G1G2 AL, VA
- Pseudanophthalmus egberti New River Valley Cave Beetle G1 VA
- Pseudanophthalmus elongatus G1G2 KY
- Pseudanophthalmus emersoni G1 IN
- Pseudanophthalmus englehardti Englehardt's Cave Beetle G1 TN
- Pseudanophthalmus eremita G1G2 IN, KY, OH
- Pseudanophthalmus exiguus G3G4 KY
- Pseudanophthalmus exoticus Exotic Cave Beetle G1 KY
- Pseudanophthalmus farrelli G1G2 TN
- Pseudanophthalmus fastigatus Tapered Cave Beetle G1 GA
- Pseudanophthalmus fluviatilis G3 AL
- Pseudanophthalmus fowlerae Fowler's Cave Beetle G1 TN
- Pseudanophthalmus frigidus Icebox Cave Beetle G1 KY
- Pseudanophthalmus fulleri G2G3 AL, GA, TN
- Pseudanophthalmus fuscus G4 WV
- Pseudanophthalmus georgiae Georgia Cave Beetle G1G2 GA
- Pseudanophthalmus globiceps G1 KY
- Pseudanophthalmus gracilis Clover Hollow Cave Beetle G1G2 VA
- Pseudanophthalmus grandis G4 WV
- Pseudanophthalmus hadenoecus Timber Ridge Cave Beetle G1 WV
- Pseudanophthalmus henroti GNR WV
- Pseudanophthalmus hesperus G1 TN
- Pseudanophthalmus higginbothami G2 WV
- Pseudanophthalmus hirsutus Cumberland Gap Cave Beetle G1G2 TN, VA
- Pseudanophthalmus hoffmani Hoffman's Cave Beetle G2G3 VA
- Pseudanophthalmus holsingeri Holsinger's Cave Beetle G1 VA
- Pseudanophthalmus horni Garman's Cave Beetle G3 KY
- Pseudanophthalmus hortulanus Garden Cave Beetle G1 VA
- Pseudanophthalmus hubbardi Hubbard's Cave Beetle G1 VA
- Pseudanophthalmus hubrichti Hubricht's Cave Beetle G1 VA
- Pseudanophthalmus humeralis G2 TN
- Pseudanophthalmus hypertrichosis G3 WV
- Pseudanophthalmus hypolithos G1 KY
- Pseudanophthalmus illinoisensis Illinois Cave Beetle G1 IL
- Pseudanophthalmus inexpectatus Surprising Cave Beetle G1G2 KY
- Pseudanophthalmus inquisitor Inquirer Cave Beetle G1 TN
- Pseudanophthalmus insularis Baker Station Cave Beetle G1 TN
- Pseudanophthalmus intermedius Intermediate Cave Beetle G2 TN
- Pseudanophthalmus intersectus Crossroads Cave Beetle G1G2 VA
- Pseudanophthalmus jonesi Grassy Cove Cave Beetle G1G2 AL, TN
- Pseudanophthalmus krameri Kramer's Cave Beetle G1 OH
- Pseudanophthalmus krekeleri Rich Mountain Cave Beetle GX WV
- Pseudanophthalmus lallemanti G1 WV
- Pseudanophthalmus leonae G1 IN
- Pseudanophthalmus limicola Maddens Cave Beetle G1G2 VA
- Pseudanophthalmus lodingi G1G2 AL
- Pseudanophthalmus loganensis G2G3 KY, TN
- Pseudanophthalmus longiceps Long-headed Cave Beetle G1G2 TN, VA
- Pseudanophthalmus macradyi Macrady's Cave Beetle G1G2 TN
- Pseudanophthalmus major Beaver Cave Beetle G1 KY
- Pseudanophthalmus menetriesi G3 KY
- Pseudanophthalmus meridionalis G2 AL
- Pseudanophthalmus montanus Dry Fork Valley Cave Beetle G1 WV
- Pseudanophthalmus nelsoni Nelson's Cave Beetle G2 VA
- Pseudanophthalmus nickajackensis Nickajack Cave Beetle G1 AL, TN
- Pseudanophthalmus nortoni Norton's Cave Beetle G1 TN
- Pseudanophthalmus occidentalis Western Cave Beetle G1G2 TN
- Pseudanophthalmus ohioensis Ohio Cave Beetle G1 OH
- Pseudanophthalmus orientalis Surprising Cave Beetle G2G3 KY
- Pseudanophthalmus orthosulcatus G1 WV
- Pseudanophthalmus packardi Packard's Cave Beetle G1G2 KY
- Pseudanophthalmus pallidus Pale Cave Beetle G1G2 TN
- Pseudanophthalmus paradoxus Ridetop Cave Beetle G1 TN
- Pseudanophthalmus parvicollis Hupps Hill Cave Beetle G1 VA
- Pseudanophthalmus parvus Tatum Cave Beetle GH KY
- Pseudanophthalmus paulus Nobletts Cave Beetle G1 TN
- Pseudanophthalmus paynei Payne's Cave Beetle G1 TN
- Pseudanophthalmus petrunkevitchi Petrunkevitch's Cave Beetle G1G2 VA
- Pseudanophthalmus pholeter Greater Adams Cave Beetle G1 KY
- Pseudanophthalmus pilosus G2G3 KY
- Pseudanophthalmus pontis Natural Bridge Cave Beetle G1 VA
- Pseudanophthalmus potamaca South Branch Valley Cave Beetle G3G4 VA, WV
- Pseudanophthalmus praetermissus Overlooked Cave Beetle G1 VA
- Pseudanophthalmus princeps G1G2 KY, TN
- Pseudanophthalmus productus G3G4 TN
- Pseudanophthalmus profundus G2 AL
- Pseudanophthalmus pubescens G3 KY
- Pseudanophthalmus punctatus Spotted Cave Beetle G2 VA
- Pseudanophthalmus pusillus Tiny Cave Beetle G1 TN
- Pseudanophthalmus pusio Ellet Valley Cave Beetle G2G3 VA
- Pseudanophthalmus puteanus Old Well Cave Beetle G1G2 KY
- Pseudanophthalmus quadratus Straley's Cave Beetle G1 VA
- Pseudanophthalmus rittmani G1G2 KY
- Pseudanophthalmus robustus Robust Cave Beetle G3G4 TN
- Pseudanophthalmus rogersae Roger's Cave Beetle G1 KY
- Pseudanophthalmus rotundatus Rotund Cave Beetle G2 TN, VA
- Pseudanophthalmus sanctipauli Saint Paul Cave Beetle G1G2 VA
- Pseudanophthalmus scholasticus Schoolhouse Cave Beetle G1 KY
- Pseudanophthalmus scutilis G1 TN
- Pseudanophthalmus seclusus Rye Cove Cave Beetle G2G3 VA
- Pseudanophthalmus senecae Seneca Cave Beetle G1 WV
- Pseudanophthalmus sequoyah Sequoyah Cave Beetle G1 AL
- Pseudanophthalmus sericus Silken Cave Beetle G1 VA
- Pseudanophthalmus shilohensis Shiloh Cave Beetle G2 IN
- Pseudanophthalmus sidus Meredith Cave Beetle G1 TN
- Pseudanophthalmus simplex Simple Cave Beetle G1G2 TN
- Pseudanophthalmus simulans Cub Run Cave Beetle G1 KY
- Pseudanophthalmus solivagus G1G2 KY
- Pseudanophthalmus steevesi Steeves' Cave Beetle G1G2 AL
- Pseudanophthalmus striatus G2G3 KY
- Pseudanophthalmus stricticollis Marengo Cave Beetle G4 IL, IN
- Pseudanophthalmus sylvaticus
- Pseudanophthalmus templetoni Templeton's Cave Beetle G1 TN
- Pseudanophthalmus tenebrosus Stevens Creek Cave Beetle G1 KY
- Pseudanophthalmus tennesseensis G3 TN
- Pseudanophthalmus tenuis G4 IN
- Pseudanophthalmus thomasi Thomas' Cave Beetle G1G2 VA
- Pseudanophthalmus tiresias Indian Grave Point Cave Beetle G1 TN
- Pseudanophthalmus transfluvialis G1G2 KY
- Pseudanophthalmus troglodytes Louisville Cave Beetle G1 KY
- Pseudanophthalmus tullahoma Duck River Cave Beetle G1G2 TN
- Pseudanophthalmus umbratilis G2G3 KY
- Pseudanophthalmus unionis Union County Cave Beetle G1G2 TN
- Pseudanophthalmus valentinei Valentine's Cave Beetle G3G4 TN
- Pseudanophthalmus vanburenensis G1 TN
- Pseudanophthalmus ventus Blowing Cave Beetle G1 TN
- Pseudanophthalmus vicarius Vicariant Cave Beetle G2G3 VA
- Pseudanophthalmus virginicus Maiden Spring Cave Beetle G1 VA
- Pseudanophthalmus wallacei Wallace's Cave Beetle G1 TN
- Pseudanophthalmus youngi Young's Cave Beetle G3G4 IN
- Pseudemys peninsularis Peninsular Cooter
- Pseudobaicalasellus bowmani Natural Bridge Cave Isopod G1 VA
- Pseudobaicalasellus henroti Henrot's Cave Isopod G2 VA
- Pseudobaicalasellus holsingeri Holsinger's Cave Isopod G5 MD, VA, WV
- Pseudobaicalasellus incurvus Incurved Cave Isopod G2G4 TN, VA
- Pseudobaicalasellus magniezi VA
- Pseudobaicalasellus mausi G2 MD, VA
- Pseudobaicalasellus vandeli Vandel's Cave Isopod G3G4 MD, VA
- Pseudocandona albicans
- Pseudocandona jeanneli Jeannel's Cave Ostracod G3 IN, KY, TN
- Pseudocandona marengoensis Marengo Cave Ostracod G1G2 IN
- Pseudocandona semicognita
- Pseudogarypus hypogeus G1G2 AZ
- Pseudogarypus orpheus Music Hall Cave Pseudoscorpion G1 CA
- Pseudogarypus speleus G1G2 CA
- Pseudoleria parvitarsus
- Pseudopolydesmus erasus
- Pseudopolydesmus pinetorum
- Pseudopolydesmus serratus Common Pink Flat-Back
- Pseudosinella aera
- Pseudosinella alba
- Pseudosinella argentea
- Pseudosinella bona G2 VA
- Pseudosinella boneti
- Pseudosinella certa Gandy Creek Cave Springtail G1 WV
- Pseudosinella christianseni Christiansen's Cave Springtail G5 AL, GA, KY, TN, VA
- Pseudosinella collina
- Pseudosinella dubia G3 AR, Mexico, OK
- Pseudosinella duodecimpunctata
- Pseudosinella erehwon G2 VA
- Pseudosinella espana Espana Cave Springtail G3 MO, Mexico, TN
- Pseudosinella espanita G1 KY, TN
- Pseudosinella extra G1G2 VA
- Pseudosinella flatua G1G2 NC, VA
- Pseudosinella folsomi
- Pseudosinella fonsa Fountain Cave Springtail G3G4 IN, OH, TN
- Pseudosinella georgia
- Pseudosinella gisini G3G4 Mexico, NC, TN, VA, WV
- Pseudosinella gisini carolina
- Pseudosinella gisini virginia
- Pseudosinella granda G3 VA
- Pseudosinella hirsuta Hirsute Cave Springtail G5 AL, GA, KY, Mexico, TN, VA
- Pseudosinella josemarii GNR WV
- Pseudosinella meganporteri G2 WV
- Pseudosinella nata G1 AL, Mexico, TN
- Pseudosinella ops VA
- Pseudosinella orba G3G4 KY, Mexico, NC, TN, VA, WV
- Pseudosinella pecki Peck's Cave Springtail G2G3 AL, FL, GA, NC, TN
- Pseudosinella rolfsi
- Pseudosinella sexoculata
- Pseudosinella sp. n. (sexoculata complex)
- Pseudosinella spinosa Spiny Cave Springtail G5 AL, GA, Mexico, TN
- Pseudosinella testa Shelled Cave Springtail G2G3 AR, Mexico, VA, WV
- Pseudosinella vespera G2 NC, VA
- Pseudosinella violenta
- Pseudosinella vita G1G2 Mexico, NM
- Pseudotremia acheron G1G2 TN
- Pseudotremia aeacus G1G2 GA
- Pseudotremia amphiorax G1G2 KY
- Pseudotremia armesi
- Pseudotremia barri Barr's Cave Millipede G2 TN
- Pseudotremia blacki Black's Cave Milliped G1 IN
- Pseudotremia burnsorum Burn's Cave Milliped G1G2 IN
- Pseudotremia callae Call's Cave Milliped G1 TN
- Pseudotremia carterensis G2G3 IN, KY
- Pseudotremia cavernarum Ellett Valley Pseudotremia Millipede G2G3 IN, KY, TN, VA
- Pseudotremia cerberus Cerberus Cave Milliped G1 VA
- Pseudotremia cercops G1 TN
- Pseudotremia cocytus
- Pseudotremia conservata TNC Cave Milliped G1G2 IN
- Pseudotremia contorta Twisted-gonopod Cave Milliped G1 VA
- Pseudotremia cookorum Cook's Cave Milliped G1G2 IN
- Pseudotremia culveri Culver's Cave Milliped G1 VA
- Pseudotremia deprehendor G1 TN, VA
- Pseudotremia douglasi Douglas' Cave Milliped G1 TN
- Pseudotremia eburnea G2G4 AL, GA, TN, VA
- Pseudotremia fergusoni Ferguson's Cave Milliped G1 VA
- Pseudotremia fongi GNR WV
- Pseudotremia fracta
- Pseudotremia fulgida Greenbrier Valley Cave Millipede G3 WV
- Pseudotremia garlandae Garland's Cave Millipede G1 TN
- Pseudotremia handi GNR WV
- Pseudotremia hobbsi
- Pseudotremia hoffmani Hoffman's Cave Millipede GNR TN
- Pseudotremia hollidayi Holliday's Cave Milliped G1 TN
- Pseudotremia hubbardi Hubbard's Cave Milliped G1G2 VA
- Pseudotremia indianae Blue River Cave Millipede G4 IN
- Pseudotremia inexpectata Devault's Cave Milliped G1 VA
- Pseudotremia jaculohamatum Harpoon Cave Milliped G1 VA
- Pseudotremia johnholsingeri Holsinger's Cave Milliped G1 VA
- Pseudotremia kerboi GNR WV
- Pseudotremia laudermilki Laudermilk's Cave Millipede GNR KY
- Pseudotremia lethe G1 TN
- Pseudotremia lictor G1 TN
- Pseudotremia loomisi Loomis's Rough-backed Millipede G1 VA
- Pseudotremia lusciosa Germany Valley Cave Millipede G1 WV
- Pseudotremia manni Mann's Cave Millipede G1 TN
- Pseudotremia merops G1 KY
- Pseudotremia minos G1 AL, TN
- Pseudotremia momus
- Pseudotremia nefanda Clark Cave Millipede G3G4 IN
- Pseudotremia nodosa G4 TN, VA
- Pseudotremia nyx G1 AL
- Pseudotremia orndorffi Orndorff's Cave Milliped G2 VA
- Pseudotremia peponocranium Pumpkin-headed Cave Milliped G1 VA
- Pseudotremia piscator Fisher Cave Milliped G1 VA
- Pseudotremia princeps South Branch Valley Cave Millipede
- Pseudotremia purselli Pursell's Cave Milliped G1 IN
- Pseudotremia reynoldsae Reynolds Cave Millipede G1 IN
- Pseudotremia rhadamanthus G1G2 AL, TN
- Pseudotremia roebuckorum Roebuck's Cave Millipede G1 TN
- Pseudotremia ryensis Rye Cove Cave Milliped G1 VA
- Pseudotremia salifodina Jones' Saltpetre Cave Milliped G1 VA
- Pseudotremia salisae Salisa's Cave Milliped G2 IN, OH
- Pseudotremia schneiderae GNR WV
- Pseudotremia sheari Shear's Cave Millipede GNR TN
- Pseudotremia shelleyi Shelley's Cave Millipede GNR NC
- Pseudotremia spira G1 KY
- Pseudotremia styx GNR KY
- Pseudotremia tuberculata G3 VA
- Pseudotremia unca G1 KY
- Pseudotremia valga G1G2 TN, VA
- Pseudotremia wallaceae Wallace's Cave Millipede G1 TN
- Pseudotremia withersi Withers' Cave Millipede G1 TN
- Pseudotriton montanus Mud Salamander
- Pseudotriton ruber Red Salamander
- Psilochorus cordatus
- Psychoda cinerea
- Psychoda minuta
- Psychoda phalaenoides
- Psychoda pusilla
- Psychoda reevesi
- Psychoda satchelli
- Psychoda umbracola
- Psychopomporus felipi GNR TX
- Psyllipsocus ramburii Cave Barklouse
- Ptenothrix atra
- Ptenothrix marmorata
- Ptenothrix quadrangularis
- Pteronotropis harperi Redeye Chub
- Pteronotus rubiginosus Wagner's Common Mustached Bat
- Pterostichus coracinus
- Pterostichus lachrymosus
- Pterostichus relictus
- Pterygoplichthys disjunctivus Vermiculated Sailfin Catfish
- Ptomaphagus appalachianus
- Ptomaphagus barri G2G3 TN
- Ptomaphagus bedfordensis
- Ptomaphagus californicus
- Ptomaphagus cavernicola
- Ptomaphagus chromolithus G2G3 AL, TN
- Ptomaphagus cocytus G1G2 AZ
- Ptomaphagus consobrinus
- Ptomaphagus cumberlandus
- Ptomaphagus elabra
- Ptomaphagus episcopus G1G2 AL
- Ptomaphagus fecundus G1 TN
- Ptomaphagus fiskei G1G2 GA
- Ptomaphagus fumosus
- Ptomaphagus giaquintoi
- Ptomaphagus gypsum
- Ptomaphagus hatchi Hatch's Cave Fungus Beetle G3 AL, TN
- Ptomaphagus hazelae G1G2 AL
- Ptomaphagus hirtus Kentucky Cave Beetle G4 KY
- Ptomaphagus hubrichti G2G3 TN
- Ptomaphagus inyoensis CA
- Ptomaphagus julius G1G2 AL
- Ptomaphagus laticornis G1G2 AL
- Ptomaphagus leo
- Ptomaphagus loedingi G1G2 AL
- Ptomaphagus longicornis G3G4 AL
- Ptomaphagus nashvillensis
- Ptomaphagus neojonesi
- Ptomaphagus parashant AZ
- Ptomaphagus shapardi
- Ptomaphagus solanum G1 AL
- Ptomaphagus spelaeus
- Ptomaphagus torodei Torode's Cave Fungus Beetle G1G2 AL
- Ptomaphagus ulkei
- Ptomaphagus valentinei Valentine's Cave Fungus Beetle G3G4 AL
- Ptomaphagus walteri G1G2 AL
- Ptomaphagus whiteselli G2G3 AL, GA
- Ptyoiulus impressus Flocculent Tailed Millipede
- Puliciphora suavis
- Puliciphora virginiensis
- Pupoides albilabris
- Pygmarrhopalites altus G2G3 KY
- Pygmarrhopalites arcus GNR ID
- Pygmarrhopalites ashcraftensis G1 IN
- Pygmarrhopalites ater Black Medusa Cave Springtail G3 IL, IN
- Pygmarrhopalites benitus
- Pygmarrhopalites bimus G3G4 IA, IN, KY, TN
- Pygmarrhopalites buffaloensis AR
- Pygmarrhopalites caedus G3 VA
- Pygmarrhopalites carolynae Carolyn's Cave Springtail G4 IL, IN, VA, WV
- Pygmarrhopalites clarus Clarus Cave Springtail G4 AR, MO, SD, VA, WA, WI, WV
- Pygmarrhopalites commorus G2G3 VA, WV
- Pygmarrhopalites dubius G2G3 AR, IA, MN
- Pygmarrhopalites fransjanssens IL
- Pygmarrhopalites hirtus
- Pygmarrhopalites hubbardi CO
- Pygmarrhopalites incantator IL
- Pygmarrhopalites jay G2G3 OK
- Pygmarrhopalites lacuna G1G2 VA
- Pygmarrhopalites leonardwoodensis MO
- Pygmarrhopalites lewisi Lewis' Cave Springtail GNR IL, IN
- Pygmarrhopalites madonnensis Madonna Cave Springtail GNR IL
- Pygmarrhopalites marshalli G3 TN, VA
- Pygmarrhopalites obtusus G1 VA
- Pygmarrhopalites pavo G3 IN, MO, TN, VA, WV
- Pygmarrhopalites plethorasari MO
- Pygmarrhopalites pygmaeus
- Pygmarrhopalites sacer G2 VA, WV
- Pygmarrhopalites salemensis IL
- Pygmarrhopalites sapo IL
- Pygmarrhopalites sextus G1 VA
- Pygmarrhopalites shoshoneiensis NV
- Pygmarrhopalites silvus G2 VA
- Pygmarrhopalites texensis G3G4 TX
- Pygmarrhopalites youngsteadtii AR
- Pygmephorus designatus
- Pygmephorus whitakeri
- Pylodictis olivaris Flathead Catfish
- Quedius alesi
- Quedius capucinus
- Quedius erythrogaster
- Quedius fulgidus Large Rove Beetle
- Quedius mesomelinus Staph Beetle
- Quedius spelaeus
- Remasellus parvus G1G2 FL
- Rhadine austinica G1G2 TX
- Rhadine babcocki
- Rhadine bullis GNR TX
- Rhadine caudata
- Rhadine exilis G3 TX
- Rhadine grubbsi TX
- Rhadine howdeni
- Rhadine infernalis G2G3 TX
- Rhadine insolita G1G2 TX
- Rhadine ivyi TX
- Rhadine koepkei G1 TX
- Rhadine larvalis
- Rhadine longicollis
- Rhadine noctivaga G1G2 TX
- Rhadine ozarkensis GH AR
- Rhadine persephone Tooth Cave Beetle G1G2 TX
- Rhadine reyesi GNR TX
- Rhadine rubra
- Rhadine russelli G1G2 TX
- Rhadine speca G2 TX
- Rhadine sprousei TX
- Rhadine subterranea G2 TX
- Rhadine tenebrosa G1G2 TX
- Rhagidia diversicolor
- Rhagidia varia G5 VA, WV
- Rhamdia quelen Silver Catfish
- Rhantus suturalis Cosmopolitan Diving Beetle
- Rheocyclops indiana Indiana Groundwater Copepod G1 IN, TN
- Rheocyclops virginianus VA
- Rhexidermis huardi
- Rhinichthys obtusus Western Blacknose Dace
- Rhinocricus ocraceus
- Rhinotus panamanus
- Rhyacodrilus sodalis Aquatic Oligochaete Worm
- Rhyacophila nigrita
- Robustocheles hilli
- Robustocheles occulta G2G3 AB, IA, WA
- Rotomelita ana G1G2 HI
- Rotomelita lokoa G1G2 HI
- Rudiloria trimaculata
- Rudolfina cavernicola
- Rugathodes sexpunctatus Common Six-Spotted Cobweaver
- Rugilus dentatus
- Rugosuscandona scharfi TX
- Ryloviella pilosa
- Rymosia fasciata
- Rymosia filipes
- Rymosia triangularis
- Sabacon cavicolens North American Cavernicolous Harvestman
- Saetigerocreagris phyllisae
- Sagittocythere barri G5 AL, IN, KY, TN
- Sagittocythere stygia G1 KY
- Salmasellus howarthi GNR OR, WA
- Salmasellus steganothrix G2 AB, MT
- Satan eurystomus Widemouth Blindcat G1G2 TX
- Sayornis phoebe Eastern Phoebe
- Scalopus aquaticus Eastern Mole
- Scaphinotus andrewsii Andrew's Snail-Eating Beetle
- Scaphinotus unicolor
- Scaphiopus holbrooki
- Scatopse notata Black Compost Fly
- Sceloporus undulatus Eastern Fence Lizard
- Schaefferia asymmetrica CO
- Schaefferia steinmanni CO
- Schaefferia unica CO
- Schizocosa ocreata Brush-Legged Split Wolf Spider
- Schizocosa saltatrix
- Schornikovdona bellensis TX
- Schrankia howarthi HI
- Sciaphilus asperatus Strawberry Root Weevil
- Sciara inconstans
- Scincella lateralis Ground Skink
- Sciodrepoides latinotum
- Sciodrepoides terminans
- Sciurus carolinensis Eastern Gray Squirrel
- Sclerobunus cavicolens G1G2 MT
- Sclerobunus jemez NV
- Sclerobunus klomax GNR NM
- Sclerobunus madhousensis G1G2 UT
- Sclerobunus speoventus CO
- Sclerobunus steinmanni CO
- Sclerobunus ungulatus G1G2 NV
- Scoliocentra brachypterna
- Scoliocentra fraterna
- Scoliocentra tincta
- Scoliopteryx libatrix Herald Moth
- Scolopocryptops sexspinosus Eastern Fire Centipede
- Scoterpes alabama Alabama Cave Millipede AL
- Scoterpes austrinus G3G4 AL, GA
- Scoterpes blountensis TN
- Scoterpes copei G3G4 GA, KY, TN
- Scoterpes hesperus TN
- Scoterpes jackdanieli TN
- Scoterpes musicarustica TN
- Scoterpes nudus GA
- Scoterpes sollmani Sollman's Cave Millipede G1 IN
- Scoterpes stewartpecki Peck's Cave Millipede AL, TN
- Scoterpes syntheticus AL
- Scoterpes tombarri Barr's Cave Millipede KY, TN
- Scoterpes tricorner TN
- Scoterpes ventus G3 TN
- Scoterpes willreevesi Reeves' Cave Millipede AL, GA
- Scotinella redempta
- Scutacarus strinatii
- Scutigera coleoptrata House Centipede
- Scytodes intricata Spitting Spiders
- Scytonotus australis
- Scytonotus granulatus Granulated Millipede
- Seborgia hershleri G1G2 TX
- Seborgia relicta G2G3 TX
- Sehirus cinctus White-Margined Burrower Bug
- Sejus sanborni
- Selachochthonius heterodentatus
- Semionellus placidus Salmon Cherry Millipede
- Semotilus atromaculatus Creek Chub
- Sensillanura barberi
- Sensillanura illina
- Sepedophilus crassus
- Sepedophilus littoreus Staph Beetle
- Sequoiadesmus krejcae CA
- Shibaia longisensilla
- Sicifera bifurca
- Sicifera dentata
- Sigmocheir calaveras
- Sigmoria fumimontis
- Simulium parnassum Dark Black Fly
- Simulium tuberosum Tubercled Black Fly
- Simulium venustum Whitestockinged Black Fly
- Simulium vernum
- Sinella agna G3G4 WV
- Sinella alata G5 IN, Mexico
- Sinella avita Avita Cave Springtail G3G4 IL, IN, KY, MO, Mexico
- Sinella baca G3G4 BC, CA, TX
- Sinella barri Barr's Cave Springtail G5 AL, AR, IL, IN, KY, MO, Mexico, TN, VA, WI
- Sinella basidens G3G4 IN, KY, TN
- Sinella caeca
- Sinella cavernarum G5 IL, IN, KY, LA, MD, MO, OH, PA, TN, VA, WA
- Sinella hoffmani Hoffman's Cave Springtail G5 KY, MD, Mexico, PA, TN, VA, WV
- Sinella krekeleri G3G4 KY, Mexico, WV
- Sinella tecta G1G2 CA
- Sinella yosiia G2G3 HI
- Sitonia hispidulus
- Sitophilus oryzae Rice Weevil
- Skistodiaptomus pallidus
- Smilodon floridanus
- Sminthurides lepus
- Sminthurides malmgreni
- Sminthurinus henshawi
- Soldanellonyx chappuisi
- Soldanellonyx chapuisi G1 IN
- Soldanellonyx monardi Mite
- Soldanellonyx morardi G1 IN
- Solenopsis geminata Tropical Fire Ant
- Somatochlora tenebrosa Clamp-Tipped Emerald
- Sorex cinereus Cinereus Shrew
- Sorex fumeus Smoky Shrew
- Sorex hoyi American Pygmy Shrew
- Sorex palustris American Water Shrew
- Sparganophilus eiseni
- Sparganophilus tamesis Amerikaanse Wortelwroeter
- Spelaedrilus multiporus G1 VA
- Spelaeorchestia koloana Kauai Cave Amphipod G1G2 HI
- Spelaeorchestia pahoehoe HI
- Speleobama vana G1 AL
- Speleochus blanchardensis AR, AZ
- Speleochus croceus G1G2 AL
- Speleochus eurous G2G3 AL
- Speleochus ferus G1G2 AL, TN
- Speleochus macosar AR, AZ
- Speleochus steevesi G4 AL, TN
- Speleochus stygicus G1G2 AL
- Speleochus synstygicus G1 AL
- Speleomaster lexi G1G2 ID
- Speleomaster pecki G1G2 ID
- Speleonura kenchristianseni G1 VA
- Speleonychia sengeri G1G2 WA
- Speleonycta ozarkensis Ozark Cave Bristletail AR, OK
- Spelobia clunipes
- Spelobia maculipennis
- Spelobia pseudosetaria
- Spelobia semioculata
- Spelobia tenebrarum Cave dung fly G5 AL, AR, GA, IL, IN, KY, MO, NY, OK, PA, TN, VA, WV
- Spelobia tuberculosa
- Spelungula cavernicola Nelson Cave Spider
- Speocirolana hardeni G2G3 TX
- Speodesmus bicornourus G2G3 TX
- Speodesmus castellanus TX
- Speodesmus echinourus G2G3 TX
- Speodesmus falcatus Sickled Cave Millipede GNR TX
- Speodesmus ivyi Ivy's Cave Millipede GNR TX
- Speodesmus reddelli Reddell's Cave Millipede GNR TX
- Speolepta leptogaster
- Speoplatyrhinus poulsoni Alabama cavefish G1 AL
- Speorthus reyesi TX
- Speorthus tuganbius G2G3 NM, TX
- Speoseya grahami G2G3 CA
- Speotrombicula trifurca
- Spermophora senoculata Shortbodied Cellar Spider
- Sphaeridia serrata
- Sphaerium simile Grooved Fingernailclam
- Sphaerium transversum Long Fingernail Clam
- Sphaeroderus stenostomus Small Snail-Eating Ground Beetle
- Sphaeromicola moria G1G2 TX
- Sphalloplana buchanani Buchanan's Cave Flatworm G1G2 KY, MD, TN
- Sphalloplana californica California Cave Flatworm G1G2 CA
- Sphalloplana chandleri Chandler's Cave Flatworm G1G2 IN, TN, VA
- Sphalloplana consimilis Powell Valley Cave Flatworm G2G3 TN, VA
- Sphalloplana culveri Culver's Cave Flatworm G1 WV
- Sphalloplana evaginata Perryville Cave Flatworm G1G2 MO
- Sphalloplana georgiana Georgia Cave Flatworm G1 GA
- Sphalloplana hoffmasteri Hoffmaster's Cave Flatworm G3G4 MD, WV
- Sphalloplana holsingeri Holsinger's Cave Flatworm G1G2 VA
- Sphalloplana hubrichti Hubricht's Cave Flatworm G2G4 IL, MO
- Sphalloplana hypogea G1G2 VA
- Sphalloplana kansensis Kansas Cave Flatworm G1G2 KS
- Sphalloplana mohri G3G4 TX
- Sphalloplana percoeca G5 AL, KY, TN, WV
- Sphalloplana pricei Refton Cave Flatworm G2G3 MD, PA
- Sphalloplana subtilis Biggers Cave Flatworm G1G2 VA
- Sphalloplana virginiana Rockbridge County Cave Flatworm G1 VA
- Sphalloplana weingartneri Weingartner's cave flatworm G4 IN
- Sphendononema guildingii Quarenta-Pernas
- Spinanycta alabamensis Alabama Cave Bristletail AL
- Spiniphora slossonae
- Spongilla lacustris Common Freshwater Sponge
- Steatoda triangulosa Triangulate Bud Spider
- Steatornis caripensis Oilbird
- Stegana coleoptrata Pomace Fly
- Stelidota geminata Strawberry Sap Beetle
- Stenistoderus rubripennis Red-Winged Rove Beetle
- Stenochironomus pulchripennis
- Stenolophus ochropezus
- Stenonema femoratum Cream Cahill
- Stenophilus californicus G1G2 CA
- Stenoponia americana
- Stenotrema angellum Kentucky Slitmouth
- Stenotrema edvardsi Ridge-And-Valley Slitmouth
- Stenotrema exodon Alabama Slitmouth
- Stenotrema hirsutum Hairy Slitmouth
- Stenotrema spinosum Carinate Slitmouth
- Stenotrema stenotrema Inland Slitmouth
- Stenotrema turbinella
- Stenus alacer
- Sternopsylla distincta
- Storeria occipitomaculata Mexican Yellowbelly Brown Snake [Hidalgoensis]
- Striaria eldora G2G3 CA
- Striatura meridionalis Median Striate
- Strigamia branneri
- Strix varia Barred Owl
- Strobilops affinis Eightfold Pinecone
- Strobilops texasianus Southern Pinecone
- Stygobromus abditus James Cave Amphipod G2G3 VA
- Stygobromus acicularis MO
- Stygobromus ackerlyi G1G2 GA
- Stygobromus alabamensis Alabama cave amphipod G5 AL, AR, KS, LA, MO, MS, OK, TN, TX
- Stygobromus albapinus White Pine amphipod NV
- Stygobromus allegheniensis G5 MD, NY, PA, WV
- Stygobromus amicus Friendly Cave Amphipod G1 MD
- Stygobromus anacostensis DC
- Stygobromus araeus Tidewater Interstitial Amphipod G3 NC, VA
- Stygobromus arbucklensis Arbuckle Mountains Cave Amphipod OK
- Stygobromus arizonensis Arizona Cave Amphipod G1 AZ
- Stygobromus bakeri TX
- Stygobromus balconis Balcones Cave Amphipod G2G3 TX
- Stygobromus baroodyi Rockbridge County Cave Amphipod G1 VA
- Stygobromus barri Barr's Cave Amphipod G2G3 MO, TN
- Stygobromus barryi G1 TN
- Stygobromus bifurcatus Bifurcated Cave Amphipod G3G4 TX
- Stygobromus biggersi Biggers' Cave Amphipod G2G4 MD, PA, VA, WV
- Stygobromus blinni Blinn's Cave Amphipod G1G2 AZ
- Stygobromus borealis Taconic Cave Amphipod G2G3 MA, NY, QC, VT
- Stygobromus boultoni Boulton's Cave Amphipod G1G2 AZ
- Stygobromus bowmani Bowman's Cave Amphipod G1G2 OK
- Stygobromus caecilius Cecil Groundwater Amphipod G1 MD
- Stygobromus canadensis Castleguard Cave Amphipod G1 AB
- Stygobromus carolinensis Carolina Seep Amphipod GH NC
- Stygobromus cherylae G1 CA
- Stygobromus clantoni Clanton's Cave Amphipod G4 AR, KS, MO, OK
- Stygobromus coloradensis Colorado Cave Amphipod G1G2 CO
- Stygobromus conradi Conrad's Cave Amphipod G1 VA
- Stygobromus cooperi Cooper's Cave Amphipod G1G2 WV
- Stygobromus cowani Cowan's Cave Amphipod G1 CA
- Stygobromus culveri Culver's Cave Amphipod G1 WV
- Stygobromus cumberlandus Cumberland Cave Amphipod G3G4 VA
- Stygobromus curroae Curro's Cave Amphipod G1G2 NM
- Stygobromus dejectus Cascade Cave Amphipod G1G2 TX
- Stygobromus dicksoni Dickson cave stygobromid G5 AL, GA, TN
- Stygobromus doughertyensis Dougherty Plain Cave Amphipod G1G2 FL, GA
- Stygobromus duplus G1G2 WA
- Stygobromus elatus G1 AR
- Stygobromus elliotti Elliott's Cave Amphipod G1G2 WA
- Stygobromus emarginatus Greenbrier Cave Amphipod G3 MD, WV
- Stygobromus ephemerus Ephemeral Cave Amphipod G1G2 VA
- Stygobromus estesi Craig County Cave Amphipod G4 VA
- Stygobromus exilis Central Kentucky Cave Amphipod G5 AL, KY, TN
- Stygobromus fecundus G1G2 TN
- Stygobromus felleri Feller's Groundwater Amphipod G1 MD
- Stygobromus fergusoni Ferguson's Cave Amphipod G1 VA
- Stygobromus finleyi Finley's Cave Amphipod G3G4 TN, VA
- Stygobromus flagellatus Ezell's Cave Amphipod G2G3 TX
- Stygobromus floridanus Florida Panhandle Cave Amphipod G1G2 CA, FL
- Stygobromus foliatus Rappahannock Spring Amphipod G2 MD, VA
- Stygobromus fontinalis G1G2 CO
- Stygobromus franzi Franz's Cave Amphipod G3G4 MD, PA, WV
- Stygobromus gallawayae Gallaway's Cave Amphipod G1 CA
- Stygobromus gardneri AR, MO
- Stygobromus glacialis Glacier National Park Cave Amphipod G1 MT
- Stygobromus gracilipes G3G4 MD, PA, VA, WV
- Stygobromus gradyi Grady's Cave Amphipod G1 CA
- Stygobromus grahami Graham's Cave Amphipod G2 CA
- Stygobromus grandis G1 GA
- Stygobromus hadenoecus Devil's Sinkhole Amphipod G1G2 TX
- Stygobromus harai Hara's Cave Amphipod G1 CA
- Stygobromus hayi Hay's Spring Amphipod G1G2 DC, PA
- Stygobromus herbsti Herbst's Cave Amphipod G2G3 NV
- Stygobromus heteropodus Pickle Springs Amphipod G1G2 MO
- Stygobromus hoffmani Hoffman's Cave Amphipod G2 VA
- Stygobromus holsingeri Holsinger's Cave Amphipod G1G2 CO
- Stygobromus hubbardi Hupp's Hill Cave Amphipod G1 VA
- Stygobromus hubbsi Malheur Cave Amphipod G1G2 OR
- Stygobromus hyporheicus Hyporheic Amphipod G1 CA
- Stygobromus idahoensis Idaho Groundwater Amphipod G1 ID
- Stygobromus imperialis Imperial Cave Amphipod G1 CA
- Stygobromus indentatus Tidewater Amphipod G3 MD, NC, VA
- Stygobromus inexpectatus G1 AL
- Stygobromus interitus New Castle Murder Hole Cave Amphipod G1G2 VA
- Stygobromus interstitialis Interstitial Amphipod G1G3 CO
- Stygobromus iowae Iowa Cave Amphipod G2G3 IA, IL, MN
- Stygobromus jemezensis Jemez Mountains Groundwater Amphipod G1G2 NM
- Stygobromus kenki Rock Creek Groundwater Amphipod G2 DC, MD, VA
- Stygobromus lacicolus Lake Tahoe Groundwater Amphipod G1 CA, NV
- Stygobromus lanensis Lane County Groundwater Amphipod G1G2 OR
- Stygobromus latus G1G3 WA
- Stygobromus leensis Lee County Cave Amphipod G1G2 VA
- Stygobromus limbus Border Cave Amphipod G1G2 TX
- Stygobromus longipes Long-legged Cave Amphipod G2G3 TX
- Stygobromus lucifugus Rubious Cave Amphipod G1G2 IL
- Stygobromus mackenziei MacKenzie's Cave Amphipod G1 CA
- Stygobromus mackini Southwestern Virginia Cave Amphipod G5 IN, KY, TN, TX, VA, WV
- Stygobromus mausi Round Hill Cave Amphipod G1 VA
- Stygobromus minutus G2G3 GA
- Stygobromus montanensis G1G2 MT
- Stygobromus montanus Mountain Cave Amphipod G1 AR
- Stygobromus morrisoni Morrison's Cave Amphipod G1G2 VA, WV
- Stygobromus mundus Bath County Cave Amphipod G1 VA
- Stygobromus myersae Myers' Groundwater Amphipod G1 CA, NV
- Stygobromus mysticus Secret Cave Amphipod G1 CA
- Stygobromus nanus G1 WV
- Stygobromus nortoni Norton's Cave Amphipod G2G3 TN
- Stygobromus obrutus Pittsylvania Well Amphipod G1G2 VA
- Stygobromus obscurus G1G2 MT
- Stygobromus onondagaensis Onondaga Cave Amphipod G3 AR, KS, MO, OK
- Stygobromus oregonensis G1G2 OR
- Stygobromus ozarkensis Ozark Cave Amphipod G4 AR, MO, OK
- Stygobromus parvus Minute Cave Amphipod G2 VA, WV
- Stygobromus paveki Pavek's Groundwater Amphipod MD
- Stygobromus paxillus Prettyboy Groundwater Amphipod G1 MD
- Stygobromus pecki Peck's Cave Amphipod G1G2 TX
- Stygobromus pennaki Pennak Cave Amphipod G2G3 CO
- Stygobromus phreaticus Northern Virginia Well Amphipod G1 VA
- Stygobromus pizzinii Pizzini's Cave Amphipod G3G4 DC, MD, PA, VA
- Stygobromus pollostus Least Cave Amphipod G2G3 WV
- Stygobromus pseudospinosus Luray Caverns Amphipod G1 VA
- Stygobromus putealis Wisconsin Well Amphipod G2G3 WI
- Stygobromus puteanus G1G2 MT
- Stygobromus quatsinensis Quatsino Cave Amphipod G1G2 AK, BC
- Stygobromus rallus Narrow Groundwater Amphipod G1G3 WA
- Stygobromus redactus Pattons Cave Amphipod G1 WV
- Stygobromus reddelli G1G2 TX
- Stygobromus rudolphi Rudolph's Groundwater Amphipod G1 CA
- Stygobromus russelli Russell's Cave Amphipod G4 TX
- Stygobromus saltuaris Williamette Natonal Forest Groundwater Amphipod G1G2 OR
- Stygobromus scottsruni Scotts Run Groundwater Amphipod VA
- Stygobromus secundus G1 AB
- Stygobromus sextarius Capital Area Groundwater Amphipod G1 DC, MD, VA
- Stygobromus sheldoni Sheldon's Groundwater Amphipod G1 CA
- Stygobromus sierrensis Sierra Groundwater Amphipod G1 CA
- Stygobromus simplex Simple Cave Amphipod G1G2 CO
- Stygobromus smithi Alabama Well Amphipod G2G3 AL, TN
- Stygobromus sparsus Gregory Cave Amphipod G1 TN
- Stygobromus spinatus Spiny Cave Amphipod G2G3 VA, WV
- Stygobromus spinosus Blue Ridge Cave Amphipod G3 VA
- Stygobromus stegerorum Madison Cave Amphipod G1 VA
- Stygobromus stellmacki Stellmack's Cave Amphipod G1G2 PA
- Stygobromus subtilis Subtle Cave Amphipod G2 IL, MI, MO
- Stygobromus tahoensis G1 CA, NV
- Stygobromus tenuis G4 CT, DC, MA, MD, NY, PA, VA, WV
- Stygobromus trinus Trinity County Cave Amphipod G1 CA
- Stygobromus tritus Worn Groundwater Amphipod G1 MT
- Stygobromus urospinatus Spinose Cave Amphipod G1G3 CO
- Stygobromus utahensis Utah Cave Amphipod G1G2 UT
- Stygobromus vitreus Mammoth Cave stygobromid G4 AL, IN, KY, TN
- Stygobromus wahkeenensis Wahkeena Creek Groundwater Amphipod G1G2 OR
- Stygobromus wardi Ward's Groundwater Amphipod G1G2 CO
- Stygobromus wengerorum Wenger Cave Amphipod G1 CA
- Stygonyx courtneyi G1G2 OR
- Stygoparnus comalensis Comal Springs Dryopid Beetle G1G2 TX
- Stygoporus oregonensis G1G2 OR
- Stygopyrgus bartonensis Barton cavesnail G1 TX
- Stygopyrgus gracilis TX
- Stygopyrgus variabilis TX
- Stylodrilus beattiei G1 VA, WV
- Stylodrilus californianus CA
- Stylodrilus wahkeenensis AL, OR, TN
- Subulina octona Miniature Awlsnail
- Superodontella cornifer
- Superodontella substriata
- Sus scrofa Eurasian Wild Pig
- Sylvilagus floridanus Eastern Cottontail
- Syngrapha alias Spruce Climbing Cutworm
- Syrphus rectus
- Tachinus fimbriatus
- Tachinus fumipennis
- Tachycines asynamorus Greenhouse Camel Cricket
- Tachypeza humeralis
- Tachyporus maculipennis
- Tachys proximus
- Tachys pumilus
- Tachys scitulus
- Tachyura lutea
- Tadarida brasiliensis Brazilian Free-Tailed Bat
- Taiyutyla loftinae CA
- Tamias striatus Eastern Chipmunk
- Tamiasciurus hudsonicus Red Squirrel
- Tanytarsus recurvatus
- Tapirus veroensis
- Taracus aspenae OR
- Taracus fluvipileus CA
- Taracus marchingtoni OR
- Taracus silvestrii G1G2 OR
- Taracus taylori GNR NV
- Taranucnus ornithes
- Tarebia granifera Quilted Melania
- Tarlina noorundi
- Tarnania tarnanii
- Tartarocreagris altimana G1G2 TX
- Tartarocreagris amblyopa G1G2 TX
- Tartarocreagris attenuata G1G2 TX
- Tartarocreagris domina G1G2 TX
- Tartarocreagris grubbsi G1G2 TX
- Tartarocreagris hoodensis G1G2 TX
- Tartarocreagris infernalis G2G3 TX
- Tartarocreagris intermedia G1G2 TX
- Tartarocreagris proserpina G1G2 TX
- Tartarocreagris reyesi GNR TX
- Tartarocreagris texana Tooth Cave Pseudoscorpion G1G2 TX
- Taxidea taxus American Badger
- Tayshaneta anopica G1G2 TX
- Tayshaneta archambaulti GNR TX
- Tayshaneta bullis GNR TX
- Tayshaneta concinna G1G2 TX
- Tayshaneta fawcetti GNR TX
- Tayshaneta microps Government Canyon Bat Cave Spider G1 TX
- Tayshaneta myopica Tooth Cave Spider G1G2 TX
- Tayshaneta oconnorae GNR TX
- Tayshaneta sandersi GNR TX
- Tayshaneta sprousei GNR TX
- Tayshaneta vidrio GNR TX
- Tayshaneta whitei GNR TX
- Tectocepheus velatus
- Tegenaria domestica Barn Funnel Weaver
- Tegenaria pagana Rural Funnel-Web Spider
- Telomerina cana
- Telomerina chillcotti
- Telomerina flavipes
- Tenuiphantes sabulosus
- Terrapene carolina Common Box Turtle
- Terrapene triunguis Three-Toed Box Turtle
- Terrilimosina racovitzai
- Tethysbaena texana GNR TX
- Tetracion jonesi Jones' Cave Millipede G3G4 AL, TN
- Tetracion tennesseensis Tennessee Cave Millipede G2G3 TN
- Tetragnatha elongata Elongate Stilt Spider
- Tetragnatha laboriosa Long-Jawed Orb Weaver
- Tetragnatha shoshone Amerikanische Streckerspinne
- Tetragnatha versicolor Versicolor Long-Jawed Orbweaver
- Texamaurops reddelli Kretschmarr Cave Mold Beetle G1G2 TX
- Texanobathynella aaronswinki TX
- Texanobathynella bowmani GNR TX
- Texanobathynella coloradoensis TX
- Texanobathynella sachi CA
- Texapyrgus diaboli Devil Tryonia TX
- Texapyrgus longleyi Striated hydrobe G1 TX
- Texella cokendolpheri Cokendolpher Cave Harvestman G1 TX
- Texella elliotti TX
- Texella hardeni G1G2 TX
- Texella hilgerensis TX
- Texella martensi CA
- Texella mulaiki G2G3 TX
- Texella reyesi Bone Cave Harvestman G2G3 TX
- Texella shoshone Shoshone Cave Harvestman G1 CA
- Texella tuberculata TX
- Texella welbourni G1G2 NM
- Texella whitei TX
- Texicerberus amistad GNR TX
- Texicerberus castilloi TX
- Texicerberus schotteae GNR TX
- Texiweckelia texensis G2G3 TX
- Texiweckeliopsis insolita G3 TX
- Texoreddellia aquilonalis TX
- Texoreddellia capitesquameo TX
- Texoreddellia coahuilensis Mexico, TX
- Texoreddellia media TX
- Texoreddellia occasus TX
- Texoreddellia texensis G4 TX
- Thalassaphorura encarpata Springtail
- Thalkethops grallatrix G1G2 NM
- Thamnophis proximus Western Ribbon Snake
- Thaumatogryllus cavicola Vovanoes Cave Cricket G1G2 HI
- Theatops phanus G2G3 TX
- Theotima makua G2G3 HI
- Theridion flavonotatum
- Theridion glaucescens
- Theridiosoma gemmosum Common Eastern Ray Spider
- Theridula opulenta Cobweb Spiders
- Thermobia domestica Firebrat
- Theromaster brunnea
- Thesiastes fossulatus
- Thornburghiella kincaidi
- Thymoites marxi
- Thymoites minero G1G2 AZ
- Tidarren sisyphoides Tent Cobweb Weaver
- Tingupa pallida Tingupa Cave Millipede G4 AR, IL, MO, TN
- Tipula abdominalis Giant Crane Fly
- Tipula algonquin
- Tipula caloptera
- Tmesiphorus costalis
- Tolus appalachius Appalachian Cave Spider G3G4 AL, TN
- Tomocerus curtus
- Tomocerus dubius
- Tomocerus flavescens
- Tomocerus vulgaris
- Tomoderus impressulus
- Toxidium compressum
- Trachelipus rathkii Rathke's Woodlouse
- Trachemys scripta Pond Slider
- Traegaardhia gracilis
- Traegaardhia holsingeri AR, KY, MO, OK
- Traegaardhia paralleloseta G1 VA
- Traegaardhia similis AR, MO
- Trechus cumberlandus
- Trechus tennesseensis
- Trechus tuckaleechee
- Triacanthella copelandi
- Trichobius major
- Trichocera fattigiana
- Trichocera hiemalis Winterpluimantennemug
- Trichocera maculipennis
- Trichocera regelationis Dooimug
- Trichocera regulationis
- Trichodrilus comalensis TX
- Trichodrilus culveri G1 WV
- Trichomorpha capillata
- Trichoniscus provisorius Ansarisiiranen
- Trichoniscus pusillus Common Pygmy Woodlouse
- Trichopetalum dux
- Trichopetalum stannardi
- Trichopetalum uncum GNR AR, IN, MO
- Trichophya pilicornis Staph Beetle
- Trichotichnus dichrous
- Trichotichnus fulgens
- Tridenchthonius juxtlahuaca
- Trigenotyla blacki Black's cave millipede G1 OK
- Trigenotyla parca
- Trimiomelba dubia
- Trinectes maculatus Freshwater Flounder
- Triodopsis complanata Glossy Threetooth
- Triodopsis hopetonensis Magnolia Threetooth
- Triodopsis tridentata Northern Threetooth
- Triodopsis vulgata Dished Threetooth
- Triphosa haesitata Tissue Moth
- Trisetobisium fallax
- Trochosa terricola Gewone Nachtwolfspin
- Troglichthys rosae Ozark cavefish G3 AR, MO, OK
- Troglocambarus maclanei North Florida Spider Cave Crayfish G1G2 FL
- Trogloglanis pattersoni Toothless Blindcat G1G2 TX
- Trombicula cavernarum
- Trombicula tibbettsi
- Tropisternus collaris Collared Water Scavenger Beetle
- Tropocyclops extensus
- Tropocyclops prasinus
- Trox aequalis Even Hide Scarab Beetle
- Trox laticollis
- Trox scaber Hide Beetle
- Tuberochernes aalbui G1G2 CA
- Tuberochernes cohni GNR AZ
- Tuberochernes ubicki G1 AZ
- Tuberona leonidasi TX
- Tullbergia clavata
- Tullbergia granulata
- Tullbergia macrochaeta
- Tychobythinus bythinioides
- Tychobythinus hubrichti G1G2 KY
- Tychobythinus jonesi G1G2 AL
- Tychobythinus strinatii G1G2 TN
- Tylparua troglodytes HI
- Typhlichthys eigenmanni Salem Plateau Cavefish G3 AR, MO
- Typhlichthys subterraneus Southern Cavefish G4 AL, GA, KY, TN
- Typhlobius caecus
- Typhlobius coecus
- Typhloelmis caroline GNR TX
- Typhloelmis finegan GNR TX
- Typhloelmis sanfelipe GNR TX
- Typhloelmis spangleri GNR TX
- Typhlogastrura alabamensis G1G2 AL
- Typhlogastrura christianseni G1 AL, TN
- Typhlogastrura fousheensis Foushee Cave Springtail G1 AR
- Typhlogastrura helleri Heller Cave Springtail GNR PA
- Typhlogastrura hubbardi G2G3 VA
- Typhlogastrura valentini Valentine's Cave Springtail G1 VA
- Typhlonesticus silvestrii Silvestri's Cave Spider
- Tyrannochthonius alabamensis
- Tyrannochthonius aladdinensis G1 AL
- Tyrannochthonius aralu G1 AL
- Tyrannochthonius archeri G1 AL
- Tyrannochthonius attenuatus G1 AL
- Tyrannochthonius avernicolus G1 AL
- Tyrannochthonius barri Barr's Cave Pseudoscorpion G1 AL
- Tyrannochthonius binoculatus G1 AL
- Tyrannochthonius chamberlini G1 AL
- Tyrannochthonius charon G1 AL
- Tyrannochthonius diabolus G1G2 AL
- Tyrannochthonius erebicus G1 AL
- Tyrannochthonius felix G1 AL
- Tyrannochthonius fiskei G1 TN
- Tyrannochthonius gnomus G1 AL
- Tyrannochthonius halopotamus G1 AL, TN
- Tyrannochthonius hypogeus G1 KY
- Tyrannochthonius infernalis G1 AL
- Tyrannochthonius jonesi Jones' Cave Pseudoscorpion G1 AL
- Tyrannochthonius muchmoreorum GNR TX
- Tyrannochthonius nergal G1 AL
- Tyrannochthonius orpheus G1G2 AL
- Tyrannochthonius osiris G1 AL
- Tyrannochthonius parvus G1G2 AL
- Tyrannochthonius pecki Peck's Cave Peudoscorpion G1 AL
- Tyrannochthonius pholeter G1 AL
- Tyrannochthonius pluto G1G2 AL
- Tyrannochthonius pupukeanus G1 HI
- Tyrannochthonius satan G1 AL
- Tyrannochthonius sheltae Shelta Cave Pseudoscorpion G1 AL
- Tyrannochthonius skeletonis G1 AL
- Tyrannochthonius steevesi Steeves' Cave Pseudoscorpion G1 TN
- Tyrannochthonius stonei HI
- Tyrannochthonius stygius G1 AL
- Tyrannochthonius tartarus G1 AL
- Tyrannochthonius tenuis G1 AL
- Tyrannochthonius torodei Torode's Cave Pseudoscorpion G1 AL
- Tyrannochthonius troglodytes G1G2 TX
- Ufocandona hannaleeae TX
- Ula elegans
- Uloborus glomosus Featherlegged Orbweaver
- Ulomorpha pilosella
- Uncinocythere ambophora G2G3 FL
- Uncinocythere equicurva
- Uncinocythere pholetera G1G2 MO
- Uncinocythere simondsi
- Uncinocythere warreni G1 AR, FL, GA
- Uncinocythere xania G3 AR, GA, IN, MO
- Uncinocythere zancla
- Uniomerus carolinianus Eastern Pondhorn
- Uroblaniulus canadensis Sickle Tailed Millipede
- Uroctonus grahami G1G2 CA
- Uroseius infirmus
- Ursus americanus American Black Bear
- Ursus arctos Brown Bear
- Usofila gracilis G1G2 CA
- Uvarus texanus
- Vachonium boneti
- Vachonium maya
- Vaejovis carolinianus Southern Unstriped Scorpion
- Validiblatta australasiae
- Vallonia pulchella Beautiful Grass Snail
- Varacosa avara Spurred Secretive Wolf Spider
- Varichaetadrilus angustipensis
- Veigaia bakeri Baker's Cave Mite G1 IN, NM
- Veigaia kochi
- Veigaia wyandottensis Wyandotte Cave Mite G1 IN
- Venezillo cacahuamilpensis
- Ventridens demissus Perforate Dome
- Ventridens gularis Throaty Dome
- Ventridens intertextus Pyramid Dome
- Ventridens ligera Globose Dome
- Vetericaris chaceorum G1 HI
- Virginia valeriae Smooth Earth Snake
- Vitronura giselae
- Vitropyrgus lillianae TX
- Vulcanochthonius aa HI
- Vulcanochthonius howarthi G1G2 HI
- Vulcanochthonius pohakuloae HI
- Wadotes calcaratus
- Wadotes saturnus
- Watobius anderisus
- Wormaldia moesta
- Wulfila albens
- Xenolimosina sicula
- Xenotrechus condei G1G2 MO
- Xenotrechus denticollis G1G2 MO
- Xenylla welchi Springtail
- Xironodrilus formosus
- Xironogiton instabilius
- Xolotrema denotatum Velvet Wedge
- Xolotrema fosteri Bladetooth Wedge
- Xolotrema obstrictum Sharp Wedge
- Yunohamella lyrica Lyric Cobweaver
- Zealeuctra narfi Northern Needlefly
- Zonitoides arboreus Bark Snail
- Zonitoides limatulus Dull Gloss
- Zonitoides nitidus Black Gloss
- Zosteractis interminata Zosteractis Cave Millipede G1 IL, MO
- Zygonopus krekeleri West Virginia Blind Cave Millipede G4 WV
- Zygonopus packardi Packard's Blind Cave Millipede G4 VA, WV
- Zygonopus weyeriensis Grand Caverns Blind Cave Millipede G3G4 VA, WV
- Zygonopus whitei Luray Caverns Blind Cave Millipede G3G4 VA, WV
No species match that filter.