Cretaceous plesiosaurs ate ammonites

Tamaki Sato () and Kazushige Tanabe
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Tamaki Sato: University of Cincinnati
Kazushige Tanabe: Geological Institute, Graduate School of Science, University of Tokyo

Nature, 1998, vol. 394, issue 6694, 629-630

Abstract: Abstract The Plesiosauria, large Mesozoic marine reptiles, have been regarded as dominant predators in Mesozoic seas, although there is only a little (including some doubtful) direct evidence of their stomach contents1,2,3,. Here we report the occurrence in Hokkaido, northern Japan, of a partial skeleton of a Cretaceous short-necked plesiosaur together with a large number of isolated ammonoid jaws. This is, to our knowledge, the first description of the stomach contents of a polycotylid plesiosaur, and the first firm evidence of prey-predator relationships between plesiosaurs and ammonites.

Date: 1998
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DOI: 10.1038/29199

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