Ozark Cave Amphipod
Stygobromus ozarkensis (Holsinger, 1967)
Taxonomy
| Kingdom | Animalia |
|---|---|
| Phylum | Arthropoda |
| Subphylum | Crustacea |
| Class | Malacostraca |
| Order | Amphipoda |
| Family | Crangonyctidae |
| Genus | Stygobromus |
| Species | Stygobromus ozarkensis (Holsinger, 1967) |
Synonyms
- Stygonectes ozarkensis Holsinger, 1967 (prior combination, CoL)
Description
Diagnostic characters
- Ecological class
- Stygobiont
- Realm
- Aquatic
- Troglomorphy
- Troglomorphic
Distribution
Range
Known from 21 counties across three states in the Ozarks karst region.
Continent
North America
Country
United States
States and provinces
Arkansas, Missouri, Oklahoma
Counties
- Arkansas
- Benton, Carroll, Izard, Madison, Marion, Newton, Stone, Washington
- Missouri
- Adair, Barry, Greene, Jasper, Lawrence, McDonald, Stone, Taney, Wright
- Oklahoma
- Adair, Cherokee, Delaware, Mayes
Karst regions
Ozarks
Genetics
Molecular resources
| Marker | Molecule | Sequences | Length | Exemplar |
|---|---|---|---|---|
| COI | mitochondrial | 1 | 535-535 bp | KY748256.1 |
1 sequence, retrieved 23 August 2026. Counts change as sequences are deposited. Search GenBank.
Download all 1 sequence records (CSV) Accession, marker, molecule type, length, GenBank definition and a direct link.
Specimens
Type material
- Holotype
- USNM 141751 · National Museum of Natural History, Smithsonian Institution
- Allotype
- USNM 141752 · National Museum of Natural History, Smithsonian Institution
- Paratype ×3
- National Museum of Natural History, Smithsonian Institution
Collections holding material
| Institution | Lots |
|---|---|
| National Museum of Natural History, Smithsonian Institution | 58 |
| American Museum of Natural History | 1 |
59 cataloged lots in 2 collections. Compiled from GBIF and not an exhaustive census: many collections are not yet digitised, and holdings are added continually. Search GBIF for specimen records.
Download all 59 specimen records (CSV) Institution, catalog number, type status and preparation. No coordinates.
Conservation and management
IUCN Red List
VU Vulnerable D2
Assessed in 1996.
NatureServe
G4 Apparently Secure
Global rank last reviewed 21 August 2002.
Subnational ranks
- Arkansas
- S2 Imperiled
- Missouri
- S3 Vulnerable
- Oklahoma
- S3 Vulnerable
Ranks looked up 23 August 2026. Conservation status changes, and a rank here is as current as that date and no more.
State and federal status
Not listed under the U.S. Endangered Species Act.
Other resources
References
- Fenolio, D.B. 2014. 2014 Ozark aquatic subterranean wildlife surveys. Report to Oklahoma Biological Survey. San Antonio Zoo, San Antonio, Texas, USA. 21 pp.
- Fenolio, D.B., Slay, M.E., Niemiller, M.L. & Richard, K. 2024. Biological inventories of caves in the Ozarks of northeastern Oklahoma: December 2024 field report. Report to Oklahoma Biological Survey. San Antonio Zoo, San Antonio, Texas, USA. 17 pp.
- Holsinger, J.R. & Lewis, J.J. 2025. Systematics of the subterranean amphipod genus Stygobromus (Crangonyctidae): Species of the Ozarks and adjacent regions. Journal of Cave and Karst Studies 87: 34–81. doi:10.4311/2024LSC0113
- McDaniel, V.R. & Smith, K.L. 1976. Cave fauna of Arkansas: selected invertebrate taxa. Journal of the Arkansas Academy of Science 30: 57–60. https://scholarworks.uark.edu/jaas/vol30/iss1/22. details
This account was last revised 28 August 2026. Conservation ranks were looked up 23 August 2026.
How to cite this account
Data sources and funding are listed in the Acknowledgments.
Spotted something wrong on this page? Report a correction. Accounts are compiled from many sources and corrections from people who know the group are the most useful email we get.