Concise hierarchy

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

Current position

Neosphenodontia (Clade) Herrera-Flores, Stubbs, Elsler & Benton 2018

Ref: D.G. DeMar Jr. et al., 2022: 5; DeMar et al., 2022: fig. 26. [inferred rank]

Alternative positions

Rhynchocephalia (Order) Günther, 1867	Ref: M.J. Benton, 2015: 439.
Sphenodontida (Order) Carroll, 1985	Ref: M.J. Benton, 2005: 395.
Sphenodontida (Suborder) Carroll, 1985	Ref: B. Grzimek et al., 1973 (1971): 598.
Sphenodontoidea (Suborder) Lydekker, 1888	Ref: O. Kuhn, 1969: 46.

Historical positions

Sphenodontida (Order) Carroll, 1985	Ref: M.J. Benton, 2005: 395.
Rhynchocephalia (Order) Günther, 1867	Ref: 1998
Sphenodontida (Suborder) Carroll, 1985	Ref: P. Uetz, [1995-]1996: 30 Dec 1996.
Rhynchocephalia (Order) Günther, 1867	Ref: 1995
Sphenodontida (Order) Carroll, 1985	Ref: R.L. Carroll, 1988: 616.
Rhynchocephalia (Order) Günther, 1867	Ref: W.E. Duellman, 1982: 958.
Sphenodontida (Suborder) Carroll, 1985	Ref: B. Grzimek et al., 1973 (1971): 598.
Sphenodontoidea (Suborder) Lydekker, 1888	Ref: O. Kuhn, 1969: 46.

Number of Subtaxa

2025	Available in Systema Naturae 2000	1g;1s; †15g;2s
1989-present	Systema Naturae 2000: 31 Jan 2017	[1g;1s]
2016	P. Uetz et al.: 16 Aug 2016	[1g;1s]
[1995-]2000	P. Uetz	1g2s
1982	W.E. Duellman: 958	1g;1s
1969	O. Kuhn: 46	[1sf;1g; †2sf;8g]