Maxim S. Arkhangelsky, Nikolay G. Zverkov, Mikhail A. Rogov, Ilya M. Stenshin & Evgeniya M. Baykina (2019)
Colymbosaurines from the Upper Jurassic of European Russia and their implication for palaeobiogeography of marine reptiles.
Palaeobiodiversity and Palaeoenvironments (advance online publication)
Plesiosaur specimens from the Upper Jurassic of European Russia are mainly referable to the 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) and subsequently revised as Plesiosauria indet. (Storrs et al. 2000) was hitherto the only and ambiguous evidence for the presence of Colymbosaurus in the Upper Jurassic of European Russia. Here, we provide descriptions of several specimens from the Volgian of European Russia referable to Colymbosaurus sp. and Colymbosaurinae indet. The presence of Colymbosaurus in the Late Jurassic (Volgian/Tithonian) of the Middle Russian Sea makes it possible to formulate hypotheses on herpetophauna exchange between NW Europe, Svalbard and European Russia. Found only in these basins, Colymbosaurus is a unifying element of marine herpetofauna in the Panboreal palaeobiogeographic superrealm.