Assertion: plesiosaur | /r/HasProperty | outflippered by most ichthyosaurs
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text: Despite their sleek bodies, plesiosaurs were far from the fastest marine reptiles of the Mesozoic Era (in a head-to-head match, most plesiosaurs would likely have been outflippered by most ichthyosaurs, the slightly earlier "fish lizards" that evolved hydrodynamic, tuna-like shapes).