Concise hierarchy

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

Phylogeny

Paraphyletic/Ancestral (para)

Ref: G. Olshevsky, 1991: 37 ("Paraorder").

Current position

Archosauriformes (Clade) Gauthier 1994 [Gauthier 2020]

Ref: T.L. Ford, 2005-present: [19 Jun 2026]; ~Ezcurra et al., 2020: ext. data fig. 4. [implicit]

Alternative positions

Archosauriformes (Clade) Gauthier 1994, nom. cl. inval.	Ref: G. Olshevsky, 1991: 37; Nesbitt, 2011: fig. 51. [indirect]
†Protopyknosia (Clade) Nesbitt, Stocker, Chatterjee, Horner & Goodwin, 2021	Ref: T.L. Ford, 2005-present: [19 Jun 2026]; Paleofile[19 Jun 2026].
Thecodontia (Superorder) Owen, 1859	Ref: G. Olshevsky, 1991: 37.

Historical positions

Thecodontia (Superorder) Owen, 1859

Ref: G. Olshevsky, 1991: 37.

Number of Subtaxa

2026	Available in Systema Naturae 2000	†1f;12g;2s;1
1989-present	Systema Naturae 2000: 20 Jun 2026	[; †1f;12g]
1991	G. Olshevsky: 37	†2f;10g;12s