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Such a definition has the advantage that it is easier to include all species with a certain morphology. Plesiosauria was in 2010 by Hillary Ketchum and Roger Benson defined as such a stem-based taxon: "all taxa more closely related to Plesiosaurus dolichodeirus and Pliosaurus brachydeirus than to Augustasaurus hagdorni".
It contains only one species, the type, Plesiosaurus dolichodeirus. Other species once assigned to this genus, including P. brachypterygius , P. guilielmiimperatoris , and P. tournemirensis have been reassigned to new genera, such as Hydrorion , Seeleyosaurus and Microcleidus .
This list of plesiosaurs is a comprehensive listing of all genera that have ever been included in the order Plesiosauria, excluding purely vernacular terms.The list includes all commonly accepted genera, but also genera that are now considered invalid, doubtful (nomen dubium), or were not formally published (nomen nudum), as well as junior synonyms of more established names, and genera that ...
Pravoslavlev recognized another species from New Zealand, E. hoodii, named by Owen in 1870 as Plesiosaurus hoodii based on a neck vertebra. [62] Welles recognized it as a nomen dubium in 1962; [33] Joan Wiffen and William Moisley concurred in a 1986 review of New Zealand plesiosaurs. [63] In 1949 Welles named a new species of Elasmosaurus, E ...
The Plesiosauridae are a monophyletic family of plesiosaurs named by John Edward Gray in 1825. [1] [2] References paleontology portal; This page was last edited on 1 ...
Polycotylidae is a family of plesiosaurs from the Cretaceous, a sister group to Leptocleididae.They are known as false pliosaurs. Polycotylids first appeared during the Albian stage of the Early Cretaceous, before becoming abundant and widespread during the early Late Cretaceous.
This genus of plesiosaur lived in North America, approximately 95 million years ago - this places it during the Cenomanian stage. Its closest relative is Elasmosaurus, and both belong to the family Elasmosauridae. There are six specimens of varying states of preservation on display at various museums in the United States.
Like all plesiosaurs, Polycotylus was a large marine reptile with a short tail, large flippers, and a broad body. It has a short neck and a long head, and was a medium-sized plesiosaur, with the type species (P. latipinnis) measuring 4.7–5.4 metres (15–18 ft) long. [4] [5] It has more neck vertebrae than other polycotylids, however.