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The holotype specimen (KUVP 1301) of Styxosaurus is an articulated skull and anterior portion of the neck. It was found in the Niobrara Chalk near Hell Creek, Logan County, Western Kansas in 1890. It was described later that year as a new species Cimoliosaurus snowii by Williston (1890a) (and Williston 1890b), who subsequently ( Williston 1906 ) referred the species to Elasmosaurus .
23 de ago. de 2023 · Two of the taxa examined here are Campanian in age: the holotype of Styxosaurus snowii, and an indeterminate species of Styxosaurus (‘Alzadasaurus pembertoni’). The other two specimens are Cenomanian: the holotype of Thalassomedon haningtoni, and an elasmosaurid specimen from Nebraska previously referred to Thalassomedon haningtoni.
Primitif, plesiosaurus dan sebagian elasmosaurids memiliki lima gigi per premaksila. Beberapa elasmosaurids bahkan memiliki lebih: seperti Terminonatator memiliki 9 dan Aristonectes memiliki 10 sampai 13, Selain itu, sebagian plesiosaurus memiliki kurang dari 60 tulang leher, Selain Elasmosaurus, plesiosaurus yang melebihi 60 tulang leher termasuk Styxosaurus, Hydralmosaurus, dan Thalassomedon.
The specimen (UNSM 50136) was sold to the University of Nebraska State Museum in 1935, where it was prepared from the remaining matrix. One of the front paddles has been on display in the UNSM ...
The carnivorous Mosasaurus is one of the largest marine reptiles in history, growing up to nearly 18m in length. Mosasaurus’ rows of sharp teeth, powerful paddle-like limbs and excellent vision make it an efficient predator, feeding on fish, cephalopods and other marine reptiles. Its name translates to ‘lizard of the Meuse River’, in reference to the location of its discovery.
Vertebra of Plesiosaurus constrictus, which Cope assigned to Elasmosaurus. In the same 1869 publication wherein he named E. platyurus and E. orientalis, Cope assigned an additional species, E. constrictus, based on a partial centrum from a neck vertebra found in the Turonian-aged clay deposits at Steyning, Sussex, in the United Kingdom.
Plesiosauria. Plesiosaurs (=Plesiosauria) are a group of secondarily aquatic carnivorous reptiles belonging to the clade Sauropterygia within the diapsid clade Euryapsida ( Taylor 1989, Caldwell 1997a ). Plesiosauria has retained phylogenetic validity for about 190 years, since the formal identification of the group by de Blainville (1835).
