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Cotylorhynchus ("Articulated beak") is a genus of caseasaurian synapsid. Arthur and Will Denison saw a Cotylorhynchus and several other strange reptiles in the dung wagon they were using to travel from Romano's Hatchery to Pooktook. The language the Cotylorhynchus and its travel companions spoke in reminded Arthur Denison of squeaking wheels.[1]

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