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Parksosaurus
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Parksosaurus : ウィキペディア英語版
Parksosaurus

''Parksosaurus'' (meaning "William Parks's lizard") is a genus of hypsilophodont ornithopod dinosaur from the early Maastrichtian-age Upper Cretaceous Horseshoe Canyon Formation of Alberta, Canada. It is based on most of a partially articulated skeleton and partial skull, showing it to have been a small, bipedal, herbivorous dinosaur. It is one of the few described non-hadrosaurid ornithopods from the end of the Cretaceous in North America, existing around 70 million years ago.
==Description==

Explicit estimates of the entire size of the animal are rare; in 2010 Gregory S. Paul estimated the length at 2.5 meters, the weight at forty-five kilograms.〔Paul, G.S., 2010, ''The Princeton Field Guide to Dinosaurs'', Princeton University Press p. 277〕 William Parks found the hindlimb of his ''T. warreni'' to be about the same length overall as that of ''Thescelosaurus neglectus'' (93.0 centimeters (3.05 ft) for ''T. warreni'' versus 95.5 centimeters (3.13 ft) for ''T. neglectus''), even though the shin was shorter than the thigh in ''T. neglectus'', the opposite of ''T. warreni''. Thus, the animal would have been comparable to the better-known ''Thescelosaurus'' in linear dimensions, despite proportional differences (around 1 meter (3.3 ft) tall at the hips, 2-2.5 meters (6.56-8.2 ft) long).〔 The proportional differences probably would have made it lighter, though, as less weight was concentrated near the thigh. Like ''Thescelosaurus'', it had thin partly ossified cartilaginous (intercostal) plates along the ribs. The shoulder girdle was robust.〔 ''Parksosaurus'' had at least eighteen teeth in the maxilla and about twenty in the lower jaw; the number of teeth in the premaxilla is unknown.〔

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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