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Noun rhynchocephalia has 1 sense
  1. Rhynchocephalia, order Rhynchocephalia - tuataras; extinct forms from middle Triassic
    --1 is a kind of animal order
    --1 is a member of Lepidosauria, subclass Lepidosauria
    --1 has members: Sphenodon, genus Sphenodon
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