Строение кладок моллюсков семейства Valvatidae (Pectinibranchia, Ectobranchia)

Abstract

The structure of ovipositions is studied in Valvata criststa (O. F. M ü l l e r, 1774), V. pulchella (S t u d e r , 1820), V. umbilicata (W e s t e r l u n d, 1886) and V. antiqua (S o w e r b y, 1838). It is determined that ovipositions of these species are well differen­tiated in the outer morphology and ovum chalaza structure. The ovipositions and ovum chalaza structure of the studied mollusc species are described.