Plesiosaurus

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Plesiosaurus

(plē'sēəsôr`əs), genus of extinct predatory marine reptiles that arose in the Triassic period of geologic time and continued into the Jurassic and Cretaceous periods. Plesiosaurs became extinct at the close of the Mesozoic era. Fossilized skeletons of them have been found in North America, Europe, and Australia. The plesiosaur had a small, short head, a long, snakelike neck, a broad, solid body, and a short tail. It had sharp interlocking teeth, and its four paddlelike legs were similar to those of a marine turtle. In total length, Plesiosaurus ranged from 10 to 60 ft (3–18 m). The term plesiosaur is sometimes applied more generally to all forms in the order Sauropterygia, which produced two lines of marine reptiles. The Plesiosaurus is an example of one trend. The other group, the pliosaurs, evolved into forms possessing short necks and gigantic skulls; the Kronosaurus, for example, had one of the largest known reptile skulls, reaching 9 ft (2.7 m) in length, and a still unclassified pliosaur first discovered on Spitsbergen in 2006 had a 10-ft (3-m) head. Paleontological evidence suggests that plesiosaurs may have given birth to live young instead of laying eggs. Plesiosaurs are classified in the phylum ChordataChordata
, phylum of animals having a notochord, or dorsal stiffening rod, as the chief internal skeletal support at some stage of their development. Most chordates are vertebrates (animals with backbones), but the phylum also includes some small marine invertebrate animals.
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, subphylum Vertebrata, class Reptilia, order Sauropterygia.
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Plesiosaurs figured out a more efficient way to expend energy while swimming was by gliding instead of furiously pushing water with their modified limbs which they started using like birds use their wings during flight.
Several scenes then ensue which involve high action sequences where Molly and Thomas experience the awesome size and power of the plesiosaur, named Elli, who helps them thwart the plans of the rich elderly couple, the Parsnips, and their development plans for the town.
But if plesiosaurs survived, there would need to be a enough to have bred over the years.
But the lack of proof for plesiosaur birth has been puzzling, said R.
They would have preyed on dolphin-like ichthyosaurs and even other plesiosaurs.
Here we report the discovery of two well-preserved plesiosaur teeth found in the uppermost part of the thin (3.
The remains were identified as a 30ft-long plesiosaur from the Jurassic period - when dinosaurs ruled the earth.
It may almost be slapstick legend at this point, but the feud was said to have begun early on in their careers when Marsh publicly noted that Cope had placed the head of a plesiosaur on--is there any nice way to tell somebody this?
Children will be delighted to find not only an Apatosaurus (formerly known as Brontosaurus) eating the veggies in the garden, but also a Parasaurolophus in the dining room, a Plesiosaur in the pool and a Tyrannosaurus in the garage stomping on Dad's car and knocking over tins of paint.
With the help of their telementors, Wagner's students researched relatively obscure subjects that he knows little about (the swimming motions of the plesiosaur, for example).
Lexcen, abandoned by his father as a small boy and raised in semipoverty, invented a keel with wings that he once boasted "looked like a giant plesiosaur with wonderful rounded flippers.