Flattened Cavesnail
Phreatodrobia micra (Pilsbry & Ferriss, 1906)
Taxonomy
| Kingdom | Animalia |
|---|---|
| Phylum | Mollusca |
| Class | Gastropoda |
| Order | Littorinimorpha |
| Family | Cochliopidae |
| Genus | Phreatodrobia |
| Species | Phreatodrobia micra (Pilsbry & Ferriss, 1906) |
Synonyms
- Valvata micra micra Pilsbry & Ferriss, 1906 (prior combination, CoL)
- Valvata micra Pilsbry & Ferriss, 1906 (prior combination, CoL)
Description
Diagnostic characters
- Ecological class
- Stygobiont
- Realm
- Aquatic
- Troglomorphy
- Troglomorphic
Distribution
Type locality
Guadalupe R., near New Braunfels, Comal Co., TX
Range
Known from 11 counties across two states in the Edwards Plateau and Balcones karst region.
Continent
North America
Country
United States
States and provinces
Alabama, Texas
Counties
- Alabama
- DeKalb
- Texas
- Bell, Comal, Comal Co, Guadalupe, Hays, Kendall, Real, Terrell, Travis, Val Verde
Karst regions
Edwards Plateau and Balcones
Genetics
Molecular resources
| Marker | Molecule | Sequences | Length | Exemplar |
|---|---|---|---|---|
| COI | mitochondrial | 8 | 434-657 bp | OR372135.1 |
| 28S | nuclear | 2 | 540-664 bp | PP860054.1 |
10 sequences, retrieved 23 August 2026. Counts change as sequences are deposited. Search GenBank.
Download all 10 sequence records (CSV) Accession, marker, molecule type, length, GenBank definition and a direct link.
Specimens
Type material
- Lectotype
- MO91322 · Academy of Natural Sciences of Drexel University
- Lectotype
- MO465629 · Academy of Natural Sciences of Drexel University
- Syntype
- 97994 · University of Michigan Museum of Zoology
- Paratype
- 62.20173 · Carnegie Museum of Natural History
Collections holding material
| Institution | Lots |
|---|---|
| Edwards Aquifer Research and Data Center, Texas State University | 556 |
| National Museum of Natural History, Smithsonian Institution | 8 |
| Field Museum of Natural History | 4 |
| Academy of Natural Sciences of Drexel University | 2 |
| Carnegie Museum of Natural History | 1 |
| Delaware Museum of Nature and Science | 1 |
| and 1 other collection | 1 |
573 cataloged lots in 7 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 573 specimen records (CSV) Institution, catalog number, type status and preparation. No coordinates.
Conservation and management
NatureServe
G2G3 Imperiled to Vulnerable
Global rank last reviewed 21 August 2002.
Subnational ranks
- Texas
- S2 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
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
- Kabat, A.R. & Hershler, R. 1993. The prosobranch snail family Hydrobiidae (Gastropoda: Rissooidea): review of classification and supraspecific taxa. Smithsonian Contributions to Zoology 547: 1–94. https://repository.si.edu/bitstream/handle/10088/5560/SCtZ-0547-Lo_res.pdf. details
- 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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