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Abyssosaurus : ウィキペディア英語版 | Abyssosaurus
''Abyssosaurus'' is an extinct genus of cryptoclidid〔 plesiosaur known from the Early Cretaceous of Chuvash Republic, western Russia. ==Discovery== ''Abyssosaurus'' is known only from the holotype specimen, Museum of Chuvash Natural Historical Society (MChEIO) no. PM/1, a partial postcranial skeleton. The holotype was collected in Poretskii District of Chuvashia, near Mishukovo, dating to the late Hauterivian faunal stage of the Early Cretaceous, about 133-130 million years ago. The specimen is thought to occupy an intermediate position between the Late Jurassic ''Tatenectes'' and ''Kimmerosaurus'' and the Late Cretaceous ''Aristonectes'' and ''Kaiwhekea''. Berezin (2011) considered ''Abyssosaurus'' to represent the first reliable record of Aristonectidae in Russia.〔 A large phylogenetic analysis performed by Roger Benson and Patrick Druckenmiller found it to be a derived cryptoclidid closely related to ''Colymbosaurus''.
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