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).
^
ab(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,
ISBN3-923376-02-2
^Filippenko D. (2011). "Fauna of gastropod molluscs in the Curonian Lagoon littoral biotopes (Baltic Sea, Kaliningrad region, Russia)". Malacologica Bohemoslovaca10: 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 Malacologica10(2): 47-75.
PDF.