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Definition of Rhynchocephalia
1. Noun. Tuataras; extinct forms from middle Triassic.
Exact synonyms: Order Rhynchocephalia
Generic synonyms: Animal Order
Group relationships: Lepidosauria, Subclass Lepidosauria
Member holonyms: Genus Sphenodon, Sphenodon
Generic synonyms: Animal Order
Group relationships: Lepidosauria, Subclass Lepidosauria
Member holonyms: Genus Sphenodon, Sphenodon