|Basic info||Taxonomic history||Classification||Relationships|
|Morphology||Ecology and taphonomy||External Literature Search||Age range and collections|
Reptilia - Rhynchocephalia
It was reranked as the suborder Sphenodontina by Kuhn (1946); it was corrected as Sphenodontia by Benton (1985), Reynoso (1996) and Apesteguia and Rougier (2007); it was reranked as the unranked clade Sphenodontia by Apesteguia et al. (2012); it was misspelled as Spheodontia by Sepkoski (2002); it was reranked as the suborder Sphenodontia by Roxo (1937), Kuhn (1966), Reynoso (2000), Simon and Kellner (2003) and Herrera-Flores et al. (2018).
It was assigned to Protorosauria by Jaekel (1910); to Lepidosauria by Benton (1985) and Reynoso (1996); to Reptilia by Sepkoski (2002); to Lepidosauria by Apesteguia and Rougier (2007); and to Rhynchocephalia by Roxo (1937), Kuhn (1946), Kuhn (1966), Reynoso (2000), Simon and Kellner (2003), Apesteguia et al. (2012) and Herrera-Flores et al. (2018).
|Year||Name and author|
|1910||Sphenodonti Jaekel p. 332|
|1910||Homoeosauri Jaekel p. 333|
|1937||Sphenodontia Roxo p. 44|
|1946||Sphenodontina Kuhn p. 62|
|1966||Sphenodontia Kuhn p. 36|
|1985||Sphenodontia Benton p. 157|
|2002||Spheodontia Sepkoski, Jr.|
|2003||Sphenodonta Meyer and Zardoya|
|2003||Sphenodontia Simon and Kellner p. 1|
|2007||Sphenodontia Apesteguia and Rougier p. 3|
|2012||Sphenodontia Apesteguia et al. p. 345 fig. 5|
|2018||Sphenodontia Herrera-Flores et al.|
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If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.