Ash Meadows pebblesnail

Ash Meadows pebblesnail
Conservation status
	; Critically Endangered (IUCN 3.1)[1]
Scientific classification
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Gastropoda
(unranked):	clade Caenogastropoda; clade Hypsogastropoda; clade Littorinimorpha
Superfamily:	Rissooidea
Family:	Hydrobiidae
Genus:	Pyrgulopsis
Species:	P. erythropoma
Binomial name
	Pyrgulopsis erythropoma; (Pilsbry, 1899)

The Ash Meadows pebblesnail (Pyrgulopsis erythropoma) is a species of freshwater snail with a gill and an operculum, aquatic gastropod mollusk in the family Hydrobiidae.

This species is endemic to the Point of Rocks spring complex, Ash Meadows, Nevada, United States.[2] Its natural habitat is springs. It is threatened by habitat loss.

The common name of this species is taken from the name of the Ash Meadows National Wildlife Refuge in Nevada.

Description

P. erythropoma is a small snail that has a height of 1.6–2.4 millimetres (0.063–0.094 in) and globose-turbinate, shell. Its differentiated from other Pyrgulopsis in that its penial filament has an absent lobe and elongate filament with the penial ornament consisting of a large, superficial ventral gland. It is distinguished from closely similar P. pisteri by its more globose shell, blade-like penis, and absence of anterior capsule gland vestibule.[2]

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References

Mollusc Specialist Group 2012. Pyrgulopsis erythropoma. 2012 IUCN Red List of Threatened Species. Downloaded on 3 March 2017.
Hershler, Robert (1994). A Review of the North American Freshwater Snail Genus Pyrgulopsis (Hydrobiidae). Washington, DC: Smithsonian Institution Press.

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[1] Mollusc Specialist Group 2012. Pyrgulopsis erythropoma. 2012 IUCN Red List of Threatened Species. Downloaded on 3 March 2017.

[review-2] Hershler, Robert (1994). A Review of the North American Freshwater Snail Genus Pyrgulopsis (Hydrobiidae). Washington, DC: Smithsonian Institution Press.