Moapa pebblesnail

The Moapa pebblesnail also known as the Muddy Valley turban snail, scientific name Pyrgulopsis avernalis, is a species of small freshwater snail with an operculum, an aquatic gastropod mollusk in the family Hydrobiidae.

Moapa pebblesnail
Scientific classification
Kingdom:
Animalia
Phylum:
Mollusca
Class:
Gastropoda
(unranked):
clade Caenogastropoda
clade Hypsogastropoda
clade Littorinimorpha
Superfamily:
Rissooidea
Family:
Hydrobiidae
Genus:
Pyrgulopsis
Species:
P. avernalis
Binomial name
Pyrgulopsis avernalis
Pilsbry, 1935
Synonyms
  • Fluminicola avernalis Pilsbry, 1935

The natural habitat of this species is springs,[2] and it is currently threatened by habitat loss. This species is endemic to the Moapa Valley, Nevada, United States[2] and the common name refers to the Moapa River in Nevada.

Description

P. avernalis is a small snail that has a height of 2.4–4.3 millimetres (0.094–0.169 in) and ovate conical shell. Its differentiated from other Pyrgulopsis in that its penial filament has a small lobe and large filament with the penial ornament consisting of a small terminal gland, a gland along the outer edge of the penial lobe and a ventral gland.[2]

Genus transfer

When originally described in 1935, it was assigned to the genus Fluminicola. In 1994, it was transferred to the genus Pyrgulopsis.[2]

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References
  1. Cordeiro, J. & Perez, K. (2011). "Pyrgulopsis avernalis". IUCN Red List of Threatened Species. 2011: e.T40047A10311032. doi:10.2305/IUCN.UK.2011-2.RLTS.T40047A10311032.en.
  2. Hershler, Robert (1994). A Review of the North American Freshwater Snail Genus Pyrgulopsis (Hydrobiidae). Washington, DC: Smithsonian Institution Press.


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