Analysis of some shell features of Valvata cristata O. F. Müller, 1774 (Prosobranchia: Valvatidae) from fish-pond in Ligota-Zabrzeg (Upper Silesia)

Izabela Rembecka

Faculty of Biology, Silesian University, Bankowa 9, 40-007 Katowice, Poland
Abstract

Height and breadth of shells of Valvata cristata O. F. Müller, 1774 were measured; growth lines on the shells were counted. The shell height was found to range from 0.5 to 1.4 mm, while the shell breadth from 1.0 to 3.5 mm; there was no significant correlation between the shell size and growth lines number. Samples of 50 individuals chosen at random each month (from May to October) were divided into size-classes and the distribution pattern of the classes in the vegetation period was analysed. Young individuals were found to appear in July.

Key words
shell; seasonal variability; Silesia; Poland
Folia Malacologica (1988) 2: 77-82
First published on-line: 2016-12-30 00:00:00
http://dx.doi.org/10.12657/folmal.002.006
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