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Valvata cristata
	Five views of a shell of Valvata cristata
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Gastropoda
Family:	Valvatidae
Genus:	Valvata
Species:	V. cristata
Binomial name
	Valvata cristata; O. F. Müller, 1774

Valvata cristata is a species of small freshwater snail with an operculum, an aquatic gastropod mollusk or micromollusk in the family Valvatidae, the valve snails.

Distribution

Czech Republic - Bohemia and Moravia^[2]
Slovakia^[2]
Poland
Germany - (Arten der Vorwarnliste)^[3]
Netherlands
the British Isles: Great Britain and Ireland
Hungary
Kaliningrad Oblast, Russia^[4]
and other areas

Shell description

The shell of this exceeding small (2–4 mm) Valvata species is very flat in its coiling, and therefore it somewhat resembles a Planorbis shell. However, the shell is dextral in coiling and has an operculum.^[5] The shell is transparent, has 3-3.5 whorls in a circular aperture. The umbilicus is wide and open, more than 1/3 of shell diameter.

Ecology

This species lives in stagnant and slow-moving water.

Myzyk (2002)^[6] described life cycle of Valvata cristata.

References

^ Müller O. F. (1774). Vermivm terrestrium et fluviatilium, seu animalium infusoriorum, helminthicorum, et testaceorum, non marinorum, succincta historia. Volumen alterum. pp. I-XXVI [= 1-36], 1-214, [1-10]. Havniae & Lipsiae. (Heineck & Faber).
^ ^a ^b (in Czech) Horsák M., Juřičková L., Beran L., Čejka T. & Dvořák L. (2010). "Komentovaný seznam měkkýšů zjištěných ve volné přírodě České a Slovenské republiky. [Annotated list of mollusc species recorded outdoors in the Czech and Slovak Republics]". Malacologica Bohemoslovaca, Suppl. 1: 1-37. PDF.
^ (in German) Glöer P. & Meier-Brook C. (2003) Süsswassermollusken. DJN, pp. 134, page 106, ISBN 3-923376-02-2
^ Filippenko D. (2011). "Fauna of gastropod molluscs in the Curonian Lagoon littoral biotopes (Baltic Sea, Kaliningrad region, Russia)". Malacologica Bohemoslovaca 10: 79–83. PDF.
^ Janus, Horst (1965). ‘’The young specialist looks at land and freshwater molluscs’’, Burke, London
^ Myzyk S. (2002). "Life cycle of Valvata cristata O. F. Müller, 1774 (Gastropoda: Heterobranchia) in the laboratory". Folia Malacologica 10(2): 47-75. PDF.