Concise hierarchy

(Kingdom) Animalia - (Phylum) Chordata - (Class) Reptilia - (Order) Rhynchocephalia

Phylogeny

Branch-based clade

Ref: D.G. DeMar Jr. et al., 2022: 4. [implicit]

Defined by the more inclusive clade (except the excluded taxon)

Rhynchocephalia (Clade) Günther 1867 [Gauthier, Estes & de Queiroz 1988]

Ref: D.G. DeMar Jr. et al., 2022: 4 ("typically", "e.g. Evans 2003").

Defined by excluded taxon

†Gephyrosaurus (Genus) Evans, 1980

Ref: D.G. DeMar Jr. et al., 2022: 4 ("typically", "e.g. Evans 2003").

Generic clade

Sphenodontia (Clade) Williston 1925 [Evans 2003]

Ref: D.G. DeMar Jr. et al., 2022: 4.

Current position

Rhynchocephalia (Order) Günther, 1867

Ref: D.G. DeMar Jr. et al., 2022: 4; DeMar et al., 2022: fig. 26. [implicit]

Alternative positions

Lepidosauria (Clade) Haeckel 1866 [Gauthier, Estes & de Queiroz 1988], nom. cl. inval.	Ref: M.J. Benton, 2005: 237; Benton, 2005: box 8.8 (p. 233).
Rhynchocephalia (Clade) Günther 1867 [Gauthier, Estes & de Queiroz 1988]	Ref: D.G. DeMar Jr. et al., 2022: 4; DeMar et al., 2022: fig. 26.

Historical positions

Rhynchocephalia (Clade) Günther 1867 [Gauthier, Estes & de Queiroz 1988]	Src: D.G. DeMar Jr. et al., 2022: 4, 5, figs. 24A, 26.
Lepidosauria (Superorder) Haeckel, 1866	Src: M.J. Benton, 2005: 237, box 8.8.

Number of Subtaxa

2025

Available in Systema Naturae 2000

1f;1g;1s; †4f;34g;29s