Assertion: cretaceous plesiosaur | /r/HasProperty | mesodira
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Source sentences:
text: Despite the scrappy nature of Leidy's type specimen, Welles (1952) and Persson (1960) concluded that Cimoliasaurus belonged to a third type of Cretaceous plesiosaur (Mesodira), with necks intermediate between elasmosaurs and pliosaurs at about two to three times the length of the skull.