Florida Panhandle Cave Amphipod
Stygobromus floridanus Holsinger & Sawicki, 2016

Taxonomy

Description

Diagnostic characters

Ecological class

Stygobiont

Realm

Aquatic

Troglomorphy

Troglomorphic

Maximum length

13 mm

Distribution

Type locality

Skipper's Spring, Washington Co., FL

Range

Known from three counties across two states in the Florida Lime Sinks karst region.

Continent

North America

Country

United States

States and provinces

California, Florida

Counties

California

El Dorado

Florida

Jackson, Washington

Karst regions

Florida Lime Sinks

Genetics

Molecular resources

43 sequences, retrieved 23 August 2026. Counts change as sequences are deposited. Search GenBank.

Download all 43 sequence records (CSV) Accession, marker, molecule type, length, GenBank definition and a direct link.

Specimens

Type material

Holotype

USNM 1222549 · National Museum of Natural History, Smithsonian Institution

Collections holding material

12 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 12 specimen records (CSV) Institution, catalog number, type status and preparation. No coordinates.

Conservation and management

NatureServe

G1G2 Critically Imperiled to Imperiled

Global rank last reviewed 20 February 2025.

Subnational ranks

Florida

S1S2 Critically Imperiled to Imperiled

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

Catalogue of Life

538LQ

GBIF

8086410

iNaturalist

869923

NCBI Taxonomy

2421118

References

• Cannizzaro, A.G., Balding, D., Lazo-Wasem, E.A. & Sawicki, T.R. 2019a. Morphological and molecular analyses reveal a new species of stygobitic amphipod in the genus Crangonyx (Crustacea: Crangonyctidae) from Jackson County, Florida, with a redescription of Crangonyx floridanus and notes on its taxonomy and biogeography. Journal of Natural History 53: 425–473. doi:10.1080/00222933.2019.1584341
• Cannizzaro, A.G., Balding, D., Lazo-Wasem, E.A. & Sawicki, T.R. 2020. A new species rises from beneath Florida: molecular phylogenetic analyses reveal cryptic diversity among the metapopulation of Crangonyx hobbsi Shoemaker, 1941 (Amphipoda: Crangonyctidae). Organisms Diversity & Evolution 20: 387–404. doi:10.1007/s13127-020-00433-4
• Cannizzaro, A.G., Balding, D., Stine, M. & Sawicki, T.R. 2019b. A new syntopic species of Stygobromus Cope, 1872 (Amphipoda: Crangonyctidae) from groundwaters in Georgia and Florida, USA, with notes on S. floridanus Holsinger & Sawicki, 2016. Journal of Crustacean Biology 39: 407–418. doi:10.1093/jcbiol/ruz034
• Holsinger, J.R. & Sawicki, T.R. 2016. A new species of the subterranean genus Stygobromus (Amphipoda: Crangonyctidae) from a cave spring in northern Florida, USA. Zootaxa 4067: 88–94. doi:10.11646/zootaxa.4067.1.7
• Poucher, S. 2022. Wildlife of Florida's Springs. An Illustrated Guide to over 150 Species. Pineapple Press, Palm Beach, Florida, USA. 196 pp. ISBN 9780000000000.
• Sisco, J.M. & Sawicki, T.R. 2023. Molecular and morphological analyses reveal a new hypogean species of amphipod in the genus Crangonyx Bate, 1859 (Crustacea: Crangonyctidae) within the floridanus species complex, from Suwannee County, Florida. Journal of Natural History 57: 21–24. doi:10.1080/00222933.2023.2247155

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.