Valvata cristata
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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
- Slovakia
- Poland
- Germany - (Arten der Vorwarnliste)
- Netherlands
- the British Isles: Great Britain and Ireland
- Hungary
- Kaliningrad Oblast, Russia
- and other areas
Shell description
The shell of this exceeding small (2–4mm) 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. 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) described life cycle of Valvata cristata.
External links
- at Animalbase taxonomy, short description, distribution, biology, status (threats), images
- Ulster Museum