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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 ...
The Zuiyo-maru carcass (ニューネッシー, Nyū Nesshii, literally "New Nessie") was a corpse, caught by the Japanese fishing trawler Zuiyō Maru (瑞洋丸) off the coast of New Zealand in 1977. The carcass's peculiar appearance resulted in speculation that it might be the remains of a sea serpent or prehistoric plesiosaur. Although ...
Plesiosaurs were themselves prey for other carnivores, as shown by bite marks left by a shark that have been discovered on a fossilized plesiosaur fin [84] and the fossilized remains of a mosasaur's stomach contents that are thought to be the remains of a plesiosaur. [85] Skeletons have also been discovered with gastroliths, stones, in their ...
The ischia (a pair of bones that formed part of the pelvis) were joined at the middle, so that a medial bar was present along the length of the pelvis, a feature usually not found in plesiosaurs. [2] Like other elasmosaurids (and plesiosaurs in general), Elasmosaurus would have had large, paddle-like limbs with very long digits. The paddles at ...
This was the first plesiosaur specimen of this caliber found in all of North America. Dr. Turner gave some of the vertebrae to a member of the Union Pacific railroad survey, John LeConte. He in turn gave the bones to paleontologist Edward Drinker Cope, who identified them as the remains of a very large plesiosaur. Cope wrote a letter to Dr ...
A broken concretion with fossils inside; late Cretaceous Pierre Shale near Ekalaka, Montana. Monument Rocks (Kansas), located 25 miles south of Oakley. By the late Cretaceous, Eurasia and the Americas had separated along the south Atlantic, and subduction on the west coast of the Americas had commenced, resulting in the Laramide orogeny, the early phase of growth of the modern Rocky Mountains.
Pliosauridae is a family of plesiosaurian marine reptiles from the Latest Triassic to the early Late Cretaceous (Rhaetian to Turonian stages) of Australia, Europe, North America and South America. The family is more inclusive than the archetypal short-necked large headed species that are placed in the subclade Thalassophonea, with basal forms ...
The earliest elasmosaurids were mid-sized, about 6 m (20 ft). In the Late Cretaceous, elasmosaurids grew as large as 11.5–12 m (38–39 ft), such as Styxosaurus, Albertonectes, and Thalassomedon. Their necks were the longest of all the plesiosaurs, with anywhere between 32 and 76 (Albertonectes) cervical vertebrae. They weighed up to several ...