Rhynchocephalia
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Rhyn·cho·ce·pha·lia | \ ˌriŋ(ˌ)kōsə̇ˈfālyə, -ālēə \
Definition of Rhynchocephalia
: an order of Reptilia that comprises forms resembling lizards but having biconcave vertebrae, immovable quadrate bones, and other peculiar osteological characters and that includes Sphenodon and numerous fossil genera — compare tuatara
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