NEW LOWER KAZANIAN (UPPER PERMIAN) TEREBRATULIDS (BRACHIOPODA) FROM THE NORTHEASTERN RUSSIAN PLATFORM: FAMILY DIELASMATIDAE SCHUCHERT, 1913

Abstract

The study of Lower Kazanian terebratulids from the eastern Russian Platform displayed a well-pronounced homeomorphy. The examination of the inner shell morphology revealed a wide diversity of brachiopod species and genera. The new genera Gruntelasma, with the type species G. bajtuganensis sp. nov., and Grigorjevaelasma, with the type species G. rossica sp. nov., are described and assigned to the family Dielasmatidae.