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However, because this spelling had been abandoned since Phillips (1871), Pliosaurus should be preserved according to Article 33.3.1 of the ICZN.The generic name is derived from πλειων, pleion, meaning "more" and σαυρος, sauros, meaning "lizard" in Ancient Greek, in reference to Owen' belief that Pliosaurus was more closely related to "saurians" (including crocodilians) than Plesiosaurus was. brachydeirus is known from the holotype which includes seven specimens found in association and housed at Oxford University Museum of Natural History, OUMNH J.9245, OUMNH J.9247 through OUMNH J.9301 and OUMNH J.10453.This centrum was the only not dorsal centrum from a series of thirty associated centra listed by Harry Seeley (1869) as belonging to P. They were collected at the Roswell (Roslyn) pit near Ely, Cambridgeshire, also in England, from between the Aulacostephanus mutabilis or Aulacostephanus eudoxus ammonite zones, of the lower Kimmeridge Clay Formation.Although the measurements of the neotype agree with these of the lost holotype, they are also similar to these of referred specimens of P.Pliosaurus currently consists of the type species P. As have been noted by several authors, Plesiosaurus (Pleiosaurus) is the original spelling of Pliosaurus, and therefore according to Article 32 of the ICZN, Pleiosaurus is the correct spelling of the generic name as well. Analysis of bones from the four flippers suggest that the animal cruised using just two fore-flippers, using the back pair for extra speed when pursuing and capturing prey. funkei brain was of a similar type and size, proportionally, to that of today's great white shark. 2012, with estimated skull lengths of 160–200 cm and a forelimb length of 300 cm for the holotype (PMO 214.135), and an estimated skull length of 200–250 cm for the referred specimen (PMO 214.136), suggesting that the animal had proportionally bigger flippers than other pliosaurs compared to the skull size and dimensions of the vertebrae. Later on, thorough scrutiny of this Svalbard specimen revealed that it was not as massive as originally claimed; total length estimates have been revised to 10–13 metres (33–43 ft) and was named Pliosaurus funkei in Knutsen et al.
CAMSM J.35991 is much more complete and can be distinguished from all other species of Pliosaurus.
These specimens were collected at Headington Pits near Oxford, Oxfordshire, England, from the Kimmeridge Clay.
It was later noted by Pocock (1908), that the material was found in the lower part of the Kimmeridge Clay, as the pits expose the contact between the Kimmeridge Clay Formation and the underlying Corallian beds.
The specific name is derived from βραχυς, brachus, meaning "short" and σπόνδυλος, spondylos, meaning "vertebra" in Ancient Greek.
It was named on the basis of a series of unassociated cervical vertebrae as the holotype.
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Several other cervical centra from the same strata at Weymouth, Dorsetshire, that had been named Plesiosaurus giganteus by Conybeare (1824), were also referred to Plesiosaurus brachyspondylus by Owen (1839). brachyspondylus to Pliosaurus but did not provide diagnosis to distinguished these vertebrae from those of the type species of the genus. giganteus was later synonymised by Lydekker (1889a) with P. Therefore, he selected a single posterior cervical centrum, CAMSM J.29564, as the neotype of P. giganteus became a nomen oblitum, forgotten name, as P.