Reptilia - Rhynchocephalia

Full reference: D. I. Whiteside. 1986. The head skeleton of the Rhaetian sphenodontid Diphydontosaurus avonis gen. et sp. nov. and the modernizing of a living fossil. Philisophical Transactions of the Royal Society of London, Series B 312:379-430

Parent taxon: Sphenodontia according to S. Apesteguia et al. 2012

Sister taxa: Clevosauridae, Godavarisaurus, Lamarquesaurus, Planocephalosaurus, Rebbanasaurus, Rhynchosauroides, Sapheosauridae, Sphenocondor, Sphenodontidae, Tingitana, Whitakersaurus

Subtaxa: Diphydontosaurus avonis

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Type: Diphydontosaurus avonis

Ecology: