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 + 4⁄1 + 1.[1]
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]
^
abcHershler R. Liu H.-P. (25 January 2010). "Two new, possibly threatened species of Pyrgulopsis (Gastropoda: Hydrobiidae) from southwestern California". Zootaxa2343: 1–17, 8 plates.
preview
^Hershler (1998). "A systematic review of the hydrobiid snails (Gastropoda: Rissooidea) of the Great Basin, western United States. Part I. Genus Pyrgulopsis". The Veliger. 41. California Malacozoological Society, Inc.: 1–132.
hdl:
10088/7293.
^Marstoniahttp://www.natureserve.org accessed 25 July 2009. (See "Concept References" in each Marstonia species.)
Further reading
Hershler, R (1998). "A systematic review of the hydrobiid snails (Gastropoda: Rissoidea) of the Great Basin, western United States. Part I. Genus Pyrgulopsis". The Veliger. 41 (1): 1–132.
Thompson, F. G.; Hershler, R. (2002). "Two genera of North American freshwater snails: Marstonia Baker, 1926, resurrected to generic status, and Floridobia, new genus (Prosobranchia: Hydrobiidae: Nymphophilinae)". The Veliger. 45 (3): 269–271.
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 + 4⁄1 + 1.[1]
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]
^
abcHershler R. Liu H.-P. (25 January 2010). "Two new, possibly threatened species of Pyrgulopsis (Gastropoda: Hydrobiidae) from southwestern California". Zootaxa2343: 1–17, 8 plates.
preview
^Hershler (1998). "A systematic review of the hydrobiid snails (Gastropoda: Rissooidea) of the Great Basin, western United States. Part I. Genus Pyrgulopsis". The Veliger. 41. California Malacozoological Society, Inc.: 1–132.
hdl:
10088/7293.
^Marstoniahttp://www.natureserve.org accessed 25 July 2009. (See "Concept References" in each Marstonia species.)
Further reading
Hershler, R (1998). "A systematic review of the hydrobiid snails (Gastropoda: Rissoidea) of the Great Basin, western United States. Part I. Genus Pyrgulopsis". The Veliger. 41 (1): 1–132.
Thompson, F. G.; Hershler, R. (2002). "Two genera of North American freshwater snails: Marstonia Baker, 1926, resurrected to generic status, and Floridobia, new genus (Prosobranchia: Hydrobiidae: Nymphophilinae)". The Veliger. 45 (3): 269–271.