English: Size comparsion of the North American brachauchenine pliosaurid plesiosaur Brachauchenius lucasi, based on USNM 4989. Unknown regions were filled in with other Brachauchenius specimens, Megacephalosaurus, Kronosaurus, and estimates by McHenry. The diver silhoutte from File:Scuba33.jpg, which is by NOAA and in the public domain.
McHenry, Colin R. (2009) Devourer of Gods: The palaeoecology of the Cretaceous pliosaur Kronosaurus queenslandicus (Thesis)[1], The University of Newcastle
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