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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.
The belief that plesiosaurs are dinosaurs is a common misconception, and plesiosaurs are often erroneously depicted as dinosaurs in popular culture. [ 141 ] [ 142 ] It has been suggested that legends of sea serpents and modern sightings of supposed monsters in lakes or the sea could be explained by the survival of plesiosaurs into modern times.
Illustration of the skeletal anatomy of a Plesiosaurus dolichodeirus from Conybeare's 1824 paper that described an almost complete plesiosaur skeleton found by Mary Anning in 1823. Plesiosaurus was a moderately sized plesiosaur that grew to 2.87–3.5 m (9.4–11.5 ft) in length.
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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 ...
Albertonectes is the longest elasmosaur, and more generally plesiosaur, known to date both in neck and total body length, estimated around 12 metres (39 ft) long and weighing up to 4.8 metric tons (5.3 short tons).
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.
"A new elasmosaurid from the early Maastrichtian of Angola and the implications of girdle morphology on swimming style in plesiosaurs". Netherlands Journal of Geosciences. 94 (1): 109– 120. Bibcode:2015NJGeo..94..109A. doi: 10.1017/njg.2014.44. S2CID 86616531.