Protostega

noun
Pro·tos·te·ga | \prəˈtästəgə\

Definition of Protostega 

: a genus of large marine turtles from the Upper Cretaceous of North America having a carapace and plastron somewhat like those of the leatherback

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History and Etymology for Protostega

New Latin, from prot- + Greek stegē roof; akin to Latin tegere to cover

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