Domed Cavesnail
Phreatodrobia nugax (Pilsbry & Ferriss, 1906)
Taxonomy
| Kingdom | Animalia |
|---|---|
| Phylum | Mollusca |
| Class | Gastropoda |
| Order | Littorinimorpha |
| Family | Cochliopidae |
| Genus | Phreatodrobia |
| Species | Phreatodrobia nugax (Pilsbry & Ferriss, 1906) |
Synonyms
- Valvata micra nugax Pilsbry & Ferriss, 1906 (subjective synonym, CoL)
Description
Diagnostic characters
- Ecological class
- Stygobiont
- Realm
- Aquatic
- Troglomorphy
- Troglomorphic
Distribution
Type locality
Spring along San Antonio R., Bexar Co., TX
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
- Bell, Bexar, Blanco, Comal, Hays, Kendall, Travis, Uvalde, Williamson
Karst regions
Edwards Plateau and Balcones
Genetics
Molecular resources
| Marker | Molecule | Sequences | Length | Exemplar |
|---|---|---|---|---|
| COI | mitochondrial | 9 | 364-609 bp | OR372110.1 |
| 28S | nuclear | 4 | 576-644 bp | PP860051.1 |
13 sequences, retrieved 23 August 2026. Counts change as sequences are deposited. Search GenBank.
Download all 13 sequence records (CSV) Accession, marker, molecule type, length, GenBank definition and a direct link.
Specimens
Type material
- Holotype
- MO359089 · Academy of Natural Sciences of Drexel University
- Lectotype
- MO77574 · Academy of Natural Sciences of Drexel University
- Paratype
- MO508796 · Academy of Natural Sciences of Drexel University
Collections holding material
| Institution | Lots |
|---|---|
| Edwards Aquifer Research and Data Center, Texas State University | 71 |
| National Museum of Natural History, Smithsonian Institution | 26 |
| Academy of Natural Sciences of Drexel University | 3 |
| Florida Museum of Natural History | 3 |
103 cataloged lots in 4 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 103 specimen records (CSV) Institution, catalog number, type status and preparation. No coordinates.
Conservation and management
IUCN Red List
DD Data Deficient na
Assessed in 2012.
NatureServe
G1G2 Critically Imperiled to Imperiled
Global rank last reviewed 25 March 2014.
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
- Gibson, R., Hutchins, B.T., Krejca, J.K., Diaz, P.H. & Sprouse, P.S. 2021. Stygobromus bakeri, a new species of groundwater amphipod (Amphipoda, Crangonyctidae) associated with the Trinity and Edwards aquifers of central Texas, USA. Subterranean Biology 38: 19–45. doi:10.3897/subtbiol.38.61787
- Gladstone, N.S., Niemiller, M.L., Hutchins, B., Schwartz, B., Czaja, A., Slay, M.E. & Whelan, N.V. 2022. Subterranean freshwater gastropod biodiversity and conservation in the United States and Mexico. Conservation Biology 36: e13722. doi:10.1111/cobi.13722
- Hershler, R. 1985. Systematic revision of the Hydrobiidae (Gastropoda, Rissoacea) of the Cuatro Cienegas Basin, Coahuila, Mexico. Malacologia 26: 31–123. https://www.biodiversitylibrary.org/page/13134858. 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
- Külköylüoğlu, O., Ataman, A., Gibson, R. & Diaz, P. 2023. A new genus, Tuberocandona gen. nov. (Crustacea, Ostracoda, Candonidae) and past to present ostracod species diversity in Texas (USA). Subterranean Biology 45: 119–140. doi:10.3897/subtbiol.45.98075
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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