Ezell's Cave Amphipod
Stygobromus flagellatus (Benedict, 1896)
Taxonomy
| Kingdom | Animalia |
|---|---|
| Phylum | Arthropoda |
| Subphylum | Crustacea |
| Class | Malacostraca |
| Order | Amphipoda |
| Family | Crangonyctidae |
| Genus | Stygobromus |
| Species | Stygobromus flagellatus (Benedict, 1896) |
Synonyms
- Stygonectes flagellatus (Benedict, 1896) (prior combination, CoL)
- Crangonyx bowersii Ulrich, 1902 (subjective synonym, CoL)
- Crangonyx flagellatus Benedict, 1896 (prior combination, CoL)
- Eucrangonyx flagellatus (Benedict, 1896) (prior combination, CoL)
- Jitygobromus flagellatus (Benedict, 1896) (prior combination, CoL)
Description
Diagnostic characters
- Ecological class
- Stygobiont
- Realm
- Aquatic
- Troglomorphy
- Troglomorphic
Distribution
Range
Known from nine counties in Texas in the Edwards Plateau and Balcones karst region.
Continent
North America
Country
United States
States and provinces
Texas
Counties
- Texas
- Bexar, Comal, Hays, Kendall, Kerr, Travis, Uvalde, Val Verde, Williamson
Karst regions
Edwards Plateau and Balcones
Genetics
Molecular resources
| Marker | Molecule | Sequences | Length | Exemplar |
|---|---|---|---|---|
| COI | mitochondrial | 4 | 501-501 bp | JQ358903.1 |
| ITS | nuclear | 1 | 212-212 bp | JQ363742.1 |
5 sequences, retrieved 23 August 2026. Counts change as sequences are deposited. Search GenBank.
Download all 5 sequence records (CSV) Accession, marker, molecule type, length, GenBank definition and a direct link.
Specimens
Type material
- Syntype
- USNM 19328 · National Museum of Natural History, Smithsonian Institution
Collections holding material
| Institution | Lots |
|---|---|
| Edwards Aquifer Research and Data Center, Texas State University | 180 |
| National Museum of Natural History, Smithsonian Institution | 105 |
| University of Texas, Biodiversity Center, Entomology Collection | 10 |
| Naturalis Biodiversity Center | 10 |
| Field Museum of Natural History | 2 |
| Museum fur Naturkunde, Berlin | 1 |
308 cataloged lots in 6 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 308 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
G2G3 Imperiled to Vulnerable
Global rank last reviewed 21 August 2002.
Subnational ranks
- Texas
- 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
- Banta, A.M. 1907. The fauna of Mayfield's Cave. Carnegie Institution of Washington Publication 67: 1–114. https://www.biodiversitylibrary.org/item/60987. details
- Hershler, R. & Longley, G. 1986. Phreatic hydrobiids (Gastropoda: Prosobranchia) from the Edwards (Balcones Fault Zone) Aquifer region, south-central Texas. Malacologia 27: 127–172. https://repository.si.edu/bitstream/handle/10088/11313/iz_HershlerLongley1986a.pdf?sequence=1&isAllowed=y. details
- Hubricht, L. 1943. Studies in the Nearctic freshwater amphipods, III. Notes on the freshwater Amphipoda of eastern United States, with descriptions of ten new species. The American Midland Naturalist 29: 683–712. doi:10.2307/2421157
- Nicholas, G. 1960. Checklist of macroscopic troglobitic organisms of the United States. The American Midland Naturalist 64: 123–160. doi:10.2307/2422897
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.
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