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Monophyletic taxon: Order †Aetosauria Nicholson & Lydekker, 1889 (reptile)
 Entity: 

Concise hierarchy

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

Included, by definition, in node-based clade

Crurotarsi (Clade) Sereno & Arcucci 1990 Ref: S.J. Nesbitt, 2011: 192 (Sereno & Arcucci, 1990).
Suchia (Clade) Krebs 1974 [Sereno 1991] Ref: S.J. Nesbitt, 2011: 195 (Sereno, 1991a).

Current position

Aetosauriformes (Clade) Hay 1930 [Parker et al. 2021] Ref: T.L. Ford, 2005-present: [13 Jul 2026]; Paleofile[13 Jul 2026]; [Nesbitt, 2011: fig. 51].

Alternative positions

Reptilia (Class) Linnaeus, 1758 Ref: T. Rees, 2006-present: [5 Jun 2025]; IRMNG[5 Jun 2025].
Thecodontia (Superorder) Owen, 1859 Ref: G. Olshevsky, 1991: 49.

Historical positions

Thecodontia (Superorder) Owen, 1859 Ref: G. Olshevsky, 1991: 49.

Number of Subtaxa

2026 Available in Systema Naturae 2000 †1f;29g;8s;6
1989-present Systema Naturae 2000: 13 Jul 2026 [; †1f;29g]
1991 G. Olshevsky: 49 †1f;16(13)[17]g;19(14)s
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Last updated: 28 Aug 2026