Colymbosaurines from the Upper Jurassic of European Russia and their implication for palaeobiogeography of marine reptiles

摘要: Plesiosaur specimens from the Upper Jurassic of European Russia are mainly referable to genus Colymbosaurus Seeley, 1874, based on elongated propodials with extensive posterodistal expansion, and relatively short mid-cervical vertebrae. However, a historical specimen described by Bogolubov (1911) subsequently revised as Plesiosauria indet. (Storrs et al. 2000) was hitherto only ambiguous evidence for presence in Russia. Here, we provide descriptions several Volgian sp. Colymbosaurinae The Late (Volgian/Tithonian) Middle Russian Sea makes it possible formulate hypotheses herpetophauna exchange between NW Europe, Svalbard Found these basins, is unifying element marine herpetofauna Panboreal palaeobiogeographic superrealm.