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The Plesiosauria [a] [4] or plesiosaurs are an order or clade of extinct Mesozoic marine reptiles, belonging to the Sauropterygia. Plesiosaurs first appeared in the latest Triassic Period , possibly in the Rhaetian stage, about 203 million years ago. [ 5 ]
Plesiosaurus (Greek: πλησίος (plesios), near to + σαῦρος (sauros), lizard) is a genus of extinct, large marine sauropterygian reptile that lived during the Early Jurassic. It is known by nearly complete skeletons from the Lias of England.
Plesiosauroidea (/ ˈ p l iː s i ə s ɔːr /; 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.
The plesiosaur, considered a successful marine predatory ancient species, may have been aided in its underwater hunting endeavors by turtle-like scales that covered its body -- which scientists ...
Plesiosaurs were ocean-going reptiles that were contemporaries of the dinosaurs, living from the Late Triassic to the end of the Cretaceous Period. Geology: Prehistoric plesiosaurs were penguins ...
Elasmosaurus differed from all other plesiosaurs by having 72 neck vertebrae; more may have been present but were later lost to erosion or after excavation. Only Albertonectes had more neck vertebrae, 76, and the two are the only plesiosaurs with a count higher than 70; more than 60 vertebrae is very derived (or "advanced") for plesiosaurs. [14 ...
Most marine reptile groups became extinct at the end of the Cretaceous period, but some still existed during the Cenozoic, most importantly the sea turtles. Other Cenozoic marine reptiles included the bothremydids , [ 4 ] palaeophiid snakes, a few choristoderes such as Simoedosaurus and dyrosaurid crocodylomorphs.
Letter concerning the discovery of the 1823 Plesiosaurus, from Mary Anning. This timeline of plesiosaur research is a chronologically ordered list of important fossil discoveries, controversies of interpretation, taxonomic revisions, and cultural portrayals of plesiosaurs, an order of marine reptiles that flourished during the Mesozoic Era.