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Three samples of the genus Cottus have been studied: type specimens from the upper Volga system (tributaries of the second and third orders and the Lake Seliger) and also individuals from the upper stream of the Oka River (near Kaluga) and from the middle Kama River (near Perm). They are morphologically related to one species Cottus koshewnikowi Gratzianow, 1907. The...
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