Pyrgulopsis

Cladus: Eukaryota
Supergroup: Opisthokonta
Regnum: Animalia
Subregnum: Eumetazoa
Cladus: Bilateria
Cladus: Nephrozoa
Cladus: Protostomia
Cladus: Spiralia
Cladus: Lophotrochozoa
Phylum: Mollusca
Classis: Gastropoda
Subclassis: Orthogastropoda
Superordo: Caenogastropoda
Ordo: Sorbeoconcha
Subordo: Hypsogastropoda
Infraordo: Littorinimorpha
Superfamilia: Rissooidea
Familia: Hydrobiidae
Genus: Pyrgulopsis

References

* Hershler, R.; Liu, H.-P. 2009: New species and records of Pyrgulopsis (Gastropoda: Hydrobiidae) from the Snake River basin, southeastern Oregon: further delineation of a highly imperiled fauna. Zootaxa, 2006: 1-22.
* Hershler, R.; Liu, H.-P.; Gustafson, D.L. 2008: A second species of Pyrgulopsis (Hydrobiidae) from the Missouri River basin, with molecular evidence supporting faunal origin through Pliocene stream capture across the northern continental divide. Journal of molluscan studies, 74: 403-413.