Exogyra

noun

Ex·​o·​gy·​ra

ˌeksəˈjīrə

: a genus of Upper Jurassic and Cretaceous bivalve mollusks that have thick shells and spirally twisted beak and are related to the true oysters

Word History

Etymology

New Latin, from exo- + -gyra (from Greek gyros ring, circle, from gyros round)

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