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phylum Chordata Umoonasaurus is an extinct genus of plesiosaur belonging to the family Leptocleididae. 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.

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clade Diapsida
superorder Sauropterygia
order Plesiosauria
family Leptocleididae
genus Umoonasaurus
Temporal range Early Cretaceous