Valvata cristata
From Wikipedia, the free encyclopedia
| Valvata cristata | |
|---|---|
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| 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[1] | |
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.
- 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
_cristata_Müller,_1774_-_Valvatidae_-_Mollusc_shell.jpeg)
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.
