English: Size comparison of the Lower Cretaceous Australian leptocleidid plesiosaur Umoonasaurus demoscyllus. Unknown regions were restored after Leptocleidus and Brancasaurus. The diver silhoutte is from File:Scuba33.jpg, which is by NOAA and in the public domain.
Cruickshank, A. R.; Long, J. A. (1997). "A new species of pliosaurid reptile from the Early Cretaceous Birdrong Sandstone of Western Australia". Records of the Western Australian Museum18: 263-276.
Sachs, S.; Hornung, J. J.; Kear, B. P. (2016). "Reappraisal of Europe’s most complete Early Cretaceous plesiosaurian: Brancasaurus brancai Wegner, 1914 from the “Wealden facies” of Germany". PeerJ4: e2813. DOI:10.7717/peerj.2813.
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