Valvata tricarinata

Valvata tricarinata
	Drawing: apertural view of shell of Valvata tricarinata
Conservation status
	NE
Scientific classification
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Gastropoda
(unranked):	clade Heterobranchia; informal group Lower Heterobranchia
Superfamily:	Valvatoidea
Family:	Valvatidae
Genus:	Valvata
Species:	V. tricarinata
Binomial name
	Valvata tricarinata; Say, 1817

Valvata tricarinata, common name the three-ridge valvata or threeridge valvata, is a species of small freshwater snail with a gill and an operculum, an aquatic gastropod mollusk in the family Valvatidae, the valve snails.

Distribution

This species occurred in the Northwest Atlantic Ocean and along the Gulf of Maine.

Shell description

There is great variation in the degree of carination of the shell.^[2]

Paleontology

Valvata tricarinata is abundant in nearly all lacustrine and fluviatile deposits in North America of the Pleistocene period. The fossil shells are more variable than the Recent ones.^[2] There were described eight forms or subspecies.^[2]

References

This article incorporates public domain text from the reference.^[2]

^ IUCN (2008). 2008 IUCN Red List of Threatened Species. <www.iucnredlist.org>. Downloaded on 20 November 2008.
^ ^a ^b ^c ^d Frank C. Baker. July 1921. New forms of Pleistocene molluks of Illinois. The Nautilus, volume 35, number 1, 22–24.

Turgeon, D.D., et al. 1998. Common and scientific names of aquatic invertebrates of the United States and Canada. American Fisheries Society Special Publication 26

External links

Photo of the shell of Valvata tricarinata

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[1] IUCN (2008). 2008 IUCN Red List of Threatened Species. <www.iucnredlist.org>. Downloaded on 20 November 2008.

[Baker-2] Frank C. Baker. July 1921. New forms of Pleistocene molluks of Illinois. The Nautilus, volume 35, number 1, 22–24.

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