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Plesiosaurus was a moderately sized plesiosaur that grew to 2.87–3.5 m (9.4–11.5 ft) in length. [ 13 ] [ 14 ] There are approximately 40 cervical vertebrae (neck vertebrae), with different specimens preserving 38 to 42 cervical vertebrae. [ 15 ]
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 ...
The fact that the osteology of the plesiosaur's neck makes it absolutely safe to say that the plesiosaur could not lift its head like a swan out of water as the Loch Ness monster does, the assumption that air-breathing animals would be easy to see whenever they appear at the surface to breathe, [146] the fact that the loch is too small and ...
They were part of Sauropterygia, the group that includes plesiosaurs. Placodonts were generally between 1 and 2 m (3 ft 3 in and 6 ft 7 in) in length, with some of the largest measuring 3 m (9.8 ft) long. The first specimen was discovered in 1830. They have been found throughout central Europe, North Africa, the Middle East and China.
Sea Monsters: A Prehistoric Adventure (also called Sea Monsters) is a 2007 American IMAX 3D documentary film by National Geographic, about prehistoric marine reptiles.It alternates modern-day sequences about the work of scientists studying the animals with computer-animated scenes depicting the prehistoric past.
Pliosaurus brachydeirus is the (combinatio nova of the) type species of the genus. It was first described and named by the English paleontologist Richard Owen in 1841, as a species of the wastebasket taxon Plesiosaurus in its own subgenus Pleiosaurus, creating Plesiosaurus (Pleiosaurus) brachydeirus. [5]
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.
Like many plesiosaurs, elasmosaurids are easily recognizable by their compact, streamlined bodies, long paddle-like limbs, short tails, proportionately small heads, and very elongated necks. [2] The oldest known representative, Jucha , dating from the Hauterivian stage of the Lower Cretaceous , [ 1 ] would have measured 5 m (16 ft) long. [ 6 ]