Abyssosaurus is a derived cryptoclidid plesiosaur from the Upper Hauterivian (Lower Cretaceous) of the Menya River, Chuvashia, Russia. It was named and described in 2011 by Alexander Yu Berezin (Berezin 2011). A partial skull associated with the holotype specimen (MChEIO, no.
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Colymbosaurus is a colymbosaurine (derived cryptoclidid) from the Late Jurassic of the UK and Svalbard, Norway. Two valid species are known, C. megadeirus from the UK, and C. svalbardensis from Svalbard, Norway. Benson and Bowdler (2014) revised the genus Colymbosaurus and summarised its complicated history:
“Seeley (1869) (p.97-101) listed two partial postcranial skeletons from the Kimmeridge Clay Formation of Ely…and Haddenham… in Cambridgeshire as belonging to a new species, Plesiosaurus megadeirus Seeley 1869. P.
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Restoration of the skeleton of Muraenosaurus in lateral view. From Andrews 1910.
Posterior cervical (neck) vertebra of Muraenosaurus in lateral and posterior view. From Andrews (1910).
Dorsal vertebra of Muraenosaurus in anterior view.
