A new species of pectinoid bivalves is described in the Permian, highlighting unique shell features.
A new peculiar genus and species of Permian pectinoid Streblopteria-like bivalves, Streblopermia minima gen. et sp. nov., is described from the Lower Changhsingian (Upper Permian) deposits of the Balygychan Block (Northeast Russia). It differs from all known forms by the configuration of the shell, combined with its very small size and a very small anterior ear of the right valve with a very narrow byssal notch.
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A.S. Biakov (2025) studied this question.
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