Also found in: Dictionary, Thesaurus, Encyclopedia, Wikipedia.
Related to Rhynchocephalia: Sphenodontidae
Rhynchocephaliaa primitive group of DIAPSID reptiles that includes Sphenodon, a genus having a pineal eye in the roof of the skull.
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005