Planispiral Valvatids (Mollusca: Gastropoda: Valvatidae) of Subgenus <i>Sibirovalvata </i>in Upper Ob Basin
S. I. Andreeva,
D. V. Kuzmenkin,
A. N. Krasnogorova
Abstract:In reservoirs and watercourses of the Upper Ob basin (south of Western Siberia) two representatives of the family Valvatidae (Valvatidae) of the subgenus Sibirovalvata, having a planispiral shell, have been noted. It is shown that two species of planispiral mollusks from this subgenus live in the region: Valvata (Sibirovalvata) frigida and V. (S.) sibirica. On the material from the Upper Ob basin, significant conchological differences between V. (S.) frigida and V. (S.) sibirica by key morphometric indices. Ac… Show more
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