| Umoonasaurus | |
|---|---|
| |
| Holotype specimen nicknamed "Eric" (AM F99374), on display at the Australian Museum | |
Scientific classification 
| |
| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | Reptilia |
| Superorder: | †Sauropterygia |
| Order: | †Plesiosauria |
| Family: | †Leptocleididae |
| Genus: | †Umoonasaurus Kear, Schroeder & Lee, 2006 |
| Species: | †U. demoscyllus
|
| Binomial name | |
| †Umoonasaurus demoscyllus Kear, Schroeder & Lee, 2006
| |
Umoonasaurus is an extinct genus of plesiosaur belonging to the family Leptocleididae. This genus lived approximately 115 million years ago during the Early Cretaceous period (Aptian-Albian stages), in shallow seas covering parts of what is now Australia. It was a relatively small animal around 2.5 metres (8.2 ft) long. An identifying trait of Umoonasaurus is three crest-ridges on its skull.