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Compared to other plesiosaur genera, Plesiosaurus has a small head. The skull is much narrower than long, [7] reaching its greatest width just behind the eyes (the postorbital bar). [8] The anterior portion is "bluntly triangular". [8] In lateral view, the skull reaches its highest point at the rear of the skull table. [9] "
While plesiosaurs varied little in the build of the trunk, and can be called "conservative" in this respect, there were major differences between the subgroups as regards the form of the neck and the skull. Plesiosaurs can be divided into two major morphological types that differ in head and neck size.
Elasmosaurus was one of few plesiosaurs known from the New World at the time, and the first recognized member of the long-necked family of plesiosaurs, the Elasmosauridae. [ 2 ] In 1869 Cope scientifically described and figured Elasmosaurus , and the preprint version of the manuscript contained a reconstruction of the skeleton which he had ...
The skull of Unktaheela has unusually large orbits, a feature commonly associated with juvenile animals. However, many anatomical characteristics of the known specimens indicate that they belonged to fully grown individuals. For example, many bones are fused in the specimens that are typically unfused in juvenile plesiosaurs.
Terminonatator (meaning "last swimmer") is a genus of elasmosaurid plesiosaur from the Late Cretaceous of Saskatchewan, Canada.It is known from a skull and partial skeleton from a young adult, found in the Campanian-age Bearpaw Formation near Notukeu Creek in Ponteix.
The Smithsonian bought a partial plesiosaur skeleton from Charles Sternberg. The specimen is now catalogued as USNM 4989 and would later serve as the type specimen of the new genus and species Brachauchenius lucasi. [39] 1888. Harry Seeley mistakenly claimed to have discovered several fossil plesiosaur embryos. [40]
Cryptoclididae is a family of medium-sized plesiosaurs that existed from the Middle Jurassic to the Early Cretaceous. They had long necks, broad and short skulls and densely packed teeth. They fed on small soft-bodied preys such as small fish and crustaceans.
Cryptoclidus was a medium-sized plesiosaur, with the largest individuals measuring up to 4 m (13 ft) long and weighing about 737–756 kg (1,625–1,667 lb). [ 1 ] [ 9 ] The fragile build of the head and teeth preclude any grappling with prey, and suggest a diet of small, soft-bodied animals such as squid and shoaling fish.
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