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Umoonasaurus : ウィキペディア英語版 | Umoonasaurus
''Umoonasaurus'' is an extinct genus of plesiosaur〔 belonging to the family Leptocleididae.〔Smith AS, Dyke GJ. 2008. The skull of the giant predatory pliosaur ''Rhomaleosaurus cramptoni'': implications for plesiosaur phylogenetics. ''Naturwissenschaften'' e-published 2008.〕 This genus lived approximately 115 million years ago (Aptian-Albian) in shallow seas covering parts of what is now Australia. It was a relatively small animal around 2.5 m (8 ft) long. An identifying trait of ''Umoonasaurus'' is three crest-ridges on its skull.〔 ''Umoonasaurus'' is known from a relatively complete skeleton preserved as opal from Coober Pedy in South Australia. This specimen was prepared by Paul Willis at the Australian Museum, Sydney, and became the focus of a nationwide fundraising appeal coordinated by ABC TV's Quantum program. ==See also==
* List of plesiosaur genera * Timeline of plesiosaur research
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