Assertion: plesiosaur's flipper | /r/MadeOf | elastoidin
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Source sentences:
text: In order to cling to the plesiosaur/tetrapod belief, and in an attempt to ignore the strong evidence for a basking shark, some argue that plesiosaurs may also have had horny fin fibres in their flippers consisting of elastoidin, and that the carcass belongs to an as yet unidentified living species of plesiosaur, i.e. with fewer neck vertebrae.