Concise hierarchy

(Kingdom) Animalia - (Phylum) Chordata - (Class) Amphibia - (Order) Caudata

Subsequent positions

Xenosalamandroidei ([unranked]) Frost et al., 2006

Ref: D.R. Frost et al., 2006: 176, 177. [assumed]

Current position

Xenosalamandroidei ([unranked]) Frost et al., 2006

Ref: D.R. Frost et al., 2006: 177. [new position]

Alternative positions

Ambystomatoidea (Suborder)	Ref: W.E. Duellman, 1982: 947.
Caudata (Order) Scopoli, 1777	Ref: D.R. Frost, 2010: 22 Nov 2010.
Plethodontoidea (Suborder)	Ref: R.L. Carroll, 1988: App. (p. 614).
Urodela (Order) Dumeril, 1806	Ref: D.R. Frost, 2004: 23 Apr 2006.

Historical positions

Xenosalamandroidei ([unranked]) Frost et al., 2006	Ref: D.R. Frost et al., 2006: 177-178; 152, 176. [new position]
Plethodontoidea (Suborder)	Ref: R.L. Carroll, 1988: App. (p. 614).
Ambystomatoidea (Suborder)	Ref: W.E. Duellman, 1982: 947-948.
Salamandroidea (Suborder) Sarasin, 1890	Ref: B. Grzimek, 1973-1975

Number of Subtaxa

2026	Available in Systema Naturae 2000	27g;396s;16ss
1989-present	Systema Naturae 2000: 22 Feb 2017	[27g;396s]
2010	D.R. Frost: 22 Nov 2010	[27g];396s
2007	D.R. Frost: 20 Mar 2007	[24g];377s
2006	D.R. Frost et al.	[25g]
1982	W.E. Duellman	2sf;23g;[214s]
1979	T.I. Storer et al.	~225s