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. The first Umoonasaurus fossil was discovered in 2006.

Quick facts about Umoonasaurus:

  • Existed from Aptian Age to 100.5 million years ago
  • Lived in a marine environment
  • Was a carnivore
  • Reproduced by live birth
  • 4 different specimens have been found by paleontologists

All the Umoonasaurus illustrations below were collected from the internet. Enjoy and explore:

Umoonasaurus was described by the following scientific paper(s):
  • R. E. Molnar. 1991. Fossil reptiles in Australia. In P. Vickers-Rich, J. M. Monaghan, R. F. Baird, & T. H. Rich (eds.), Vertebrate Paleontology of Australasia
  • 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