Reference

Kear, B. P., Schroeder, N. I. and Lee, M. S. Y. 2006. An archaic crested plesiosaur in opal from the Lower Cretaceous high-latitude deposits of Australia. Biology Letters, 2, (4), 615-619. doi:10.1098/rsbl.2006.0504 [Umoonasaurus demoscyllus gen. et sp. nov.]