| Summary: | © 2015, Pleiades Publishing, Ltd. The biogeography of Permian marine bivalves of the Boreal Superrealm is considered. Two biochores, the Western Boreal and Eastern Boreal realms, divided into a number of provinces are distinctly recognized. The Western Boreal Realm, which comprises the East European, West European, Greenland–Canadian, and Spitsbergen provinces, is distinguished by the widespread occurrence of pteriacians, myalinids, mitilids, Pseudomonotis, Cyrtorostra, and Netschajewia. The Eastern Boreal Realm comprises the Pechora, Novaya Zemlya, Taimyr, Verkhoyansk–Okhotsk, Kolyma–Omolon, Mongol–Transbaikalian, and Yukon provinces and is characterized by the widespread occurrence of Inoceramus-like bivalves of the family Kolymiidae and a high proportion of genera with bipolar distribution.
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