Concise hierarchy

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

Phylogeny

Probably Paraphyletic/Ancestral (para)

Ref: R.R. Reisz et al., 2011: 3733 ("artificial grouping"); fig. 4.

Excluded, by definition, from branch-based clade

Lepidosauriformes (Clade) Gauthier, Estes & de Queiroz 1988

Ref: J. Gauthier et al., 1988a: 28 ("younginiforms").

Current position

Diapsida (Clade) Osborn 1903 [Gauthier & de Queiroz 2020]

Ref: M.J. Benton, 2015: 438; Reisz et al., 2011: fig. 4. [implicit]

Alternative positions

Diapsida (Infraclass)	Ref: M.J. Benton, 2015: 438; Benton, 2015: box 5.1 (p. 124).
Neodiapsida (Clade) Benton 1985	Ref: M.J. Benton, 2005: 395, fig. 6.6; Reisz et al., 2011: fig. 4.
Reptilia (Class) Linnaeus, 1758	Ref: T. Rees, 2006-present: [5 Jun 2025]; IRMNG[5 Jun 2025].

Historical positions

Diapsida (Infraclass)	Ref: M.J. Benton, 2015: 438, box 5.1 (p. 124).
Neodiapsida (Clade) Benton 1985	Ref: M.J. Benton, 2005: 395, box 5.1, fig. 6.6.

Number of Subtaxa

2025	Available in Systema Naturae 2000	†1f;2g;1s
1989-present	Systema Naturae 2000: 6 Apr 2017	[; †1f;2g]