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Temporal range: Early Cretaceous, 133–130 Ma
Scientific classification e
Kingdom: Animalia
Phylum: Chordata
Class: Reptilia
Superorder: Sauropterygia
Order: Plesiosauria
Family: Cryptoclididae
Genus: Abyssosaurus
Berezin, 2011
Type species
Abyssosaurus nataliae
Berezin, 2011

Abyssosaurus is an extinct genus of cryptoclidid[1] plesiosaur known from the Early Cretaceous of Chuvash Republic, western Russia.[2]


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.[2] A large phylogenetic analysis performed by Roger Benson and Patrick Druckenmiller found it to be a derived cryptoclidid closely related to Colymbosaurus.[1]


Abyssosaurus was first named by A. Yu. Berezin in 2011 and the type species is Abyssosaurus nataliae.[2]

See also[edit]


  1. ^ a b Benson, R. B. J.; Druckenmiller, P. S. (2013). "Faunal turnover of marine tetrapods during the Jurassic-Cretaceous transition". Biological Reviews. 89: 1–23. doi:10.1111/brv.12038. PMID 23581455. 
  2. ^ a b c A. Yu. Berezin (2011). "A new plesiosaur of the family Aristonectidae from the early cretaceous of the center of the Russian platform". Paleontological Journal. 45 (6): 648–660. doi:10.1134/S0031030111060037.