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The many plesiosaur species may have differed considerably in their swimming speeds, reflecting the various body shapes present in the group. While the short-necked "pliosauromorphs" (e.g. Liopleurodon ) may have been fast swimmers, the long-necked "plesiosauromorphs" were built more for manoeuvrability than for speed, slowed by a strong skin ...
Four strong paddle-like limbs suggest that Liopleurodon was a powerful swimmer. Its four-flipper mode of propulsion is characteristic of all plesiosaurs. A study involving a swimming robot has demonstrated that although this form of propulsion is not especially efficient, it provides very good acceleration—a desirable trait in an ambush predator.
The vertebrae that transitioned between the neck and back vertebrae in the pectoral region of plesiosaurs, close to the front margin of the forelimb girdle, are often termed pectoral vertebrae. Elasmosaurus had three pectoral vertebrae, which is a common number for elasmosaurids.
Peloneustes (meaning 'mud swimmer') is a genus of pliosaurid plesiosaur from the Middle Jurassic of England. Its remains are known from the Peterborough Member of the Oxford Clay Formation, which is Callovian in age. It was originally described as a species of Plesiosaurus by palaeontologist Harry Govier Seeley in 1869, before being given its ...
Plesiosauroidea. Plesiosauroidea (/ ˈpliːsiəsɔːr /; Greek: πλησιος plēsios 'near, close to' and σαυρος sauros 'lizard') is an extinct clade of carnivorous marine reptiles. They have the snake -like longest neck to body ratio of any reptile. Plesiosauroids are known from the Jurassic and Cretaceous periods.
Description. Plesiosaur swimming animation.ogv. Efficient swimming motions of plesiosaurs. 3D model based on Meyerasaurus victor (specimen SMNS 12478). Animation showing the most efficient swimming motions that were found in each of the three joint ranges (wide, medium, and narrow). For each joint range, animations are shown for both sets of ...
Libonectes was a medium-sized plesiosaur, with the complete specimen (SMNK-PAL 3978) measuring 7.2 metres (24 ft) long. [5] The type specimen belonged to an individual with a neck measuring 5.06 metres (16.6 ft) long. [6] The animal was very similar to the related Thalassomedon, though the structure of the neck vertebrae were different, with ...
Plesiosaurus is the archetypical genus of Plesiosauria and the first to be described, hence lending its name to the order. Conybeare and De la Beche coined the name for scattered finds from the Bristol region, Dorset, and Lyme Regis in 1821. [6] The type species of Plesiosaurus, P. dolichodeirus, was named and described by Conybeare in 1824 on ...