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Pyrgulopsis

Genus of gastropods From Wikipedia, the free encyclopedia

Pyrgulopsis
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Pyrgulopsis is a genus of freshwater snails with a gill and an operculum, aquatic gastropod mollusks in the family Hydrobiidae.

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Etymology

The name Pyrgulopsis is composed from Pyrgula, another genus of snail, and opsis = aspect of.[1]

Description

Generic characters of the genus Pyrgulopsis are: the shell is minute, conically turreted, somewhat elongated, imperforate and unicarinate. The apex is acute. The aperture is ovate. The edge of the aperture, called the peritreme, is continuous.[1] The operculum is ovate, thin, corneous and spiral, with polar point well forward and approximating the columella.[1]

The jaw is thin and membranaceous.[1] The radula is odontophore, with teeth are arranged in transverse rows, according to the formula 3 + 1 + 3. Formula for denticles of rhachidian: 4 + 1 + 41 + 1.[1]

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Distribution

The distribution of the genus Pyrgulopsis includes Western and South-western United States.[1] Snails of species in the genus Pyrgulopsis occur in fresh water and in brackish water.[1]

Species

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Shells of Pyrgulopsis deserta.
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A shell of Pyrgulopsis neomexicana.

Pyrgulopsis is the largest genus of freshwater gastropods in the North America. In 2014, 139 species were recognized in this genus.[4]

Species in the genus Pyrgulopsis include:[5]

Eastern North American species of Pyrgulopsis[20] are considered to be in separate genus Marstonia according to the Thompson and Hershler (2002).[21]

  • Pyrgulopsis agarhecta (F. G. Thompson, 1969) - Ocmulgee marstonia - Marstonia agarhecta F.G. Thompson, 1969
  • Pyrgulopsis arga - ghost marstonia - Marstonia arga F.G. Thompson, 1977
  • Pyrgulopsis castor (F. G. Thompson, 1977) - beaverpond marstonia - Marstonia castor F.G. Thompson, 1977
  • Pyrgulopsis halcyon (F. G. Thompson, 1977) - halcyon marstonia - Marstonia halcyon F.G. Thompson, 1977
  • Pyrgulopsis hershleri F. G. Thompson, 1995 - Coosa pyrg - Marstonia hershleri (F.G. Thompson, 1995)
  • Pyrgulopsis letsoni (Walker, 1901) - gravel pyrg - Marstonia letsoni (Walker, 1901)
  • Pyrgulopsis lustrica (Pilsbry, 1890) - boreal marstonia - Marstonia lustrica (Pilsbry, 1890)
  • Pyrgulopsis ogmoraphe (F. G. Thompson, 1977) - royal springsnail - Marstonia ogmorhaphe (F.G. Thompson, 1977)
  • Pyrgulopsis olivacea (Pilsbry, 1895) - olive marstonia - Marstonia olivacea (Pilsbry, 1895)
  • Pyrgulopsis ozarkensis Hinkley, 1915 - Ozark pyrg - Marstonia ozarkensis (Hinkley, 1915)
  • Pyrgulopsis pachyta (F. G. Thompson, 1977) - armored marstonia - Marstonia pachyta F.G. Thompson, 1977
  • Pyrgulopsis scalariformis (Wolf, 1869) - moss pyrg - Marstonia scalariformis (Wolf, 1869)
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References

Further reading

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