Umoonasaurus was a plesiosaur, a type of marine reptile. It was not a dinosaur, though it coexisted with many dinosaurs. Umoonasaurus lived during the Early Cretaceous.
All these Umoonasaurus pictures were collected from the internet. Enjoy and explore:
- B. P. Kear. 2007. A juvenile pliosauroid plesiosaur (Reptilia: Sauropterygia) from the Lower Cretaceous of South Australia. Journal of Paleontology 81(1):154-162
- B. P. Kear and N. I. Schroeder. 2006. An archaic crested plesiosaur in opal from the Lower Cretaceous high-latitude deposits of Australia. Biology Letters 2:615-619