Abstract
The problems of taxonomy of Permian pectinoid bivalves are briefly considered in the context of the study well-known Upper Paleozoic genus Streblopteria M’Coy and its historical development in Northeast Russia. Two new stratigraphically important species have been described from the Lower and Middle Permian deposits of the Omolon massif: S. parenensis sp. nov. and S. gracilicosta sp. nov.
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