Concise hierarchy

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

Phylogeny

Node-based clade		Ref: M. Laurin, 1991: 83. [implicit]
Apomorphy-based clade		Ref: M.J. Benton, 1985: 112 ("apomorphy: closure of its lower temporal opening").

Defined by the most recent common ancestor (and all its descendants) of

†Araeoscelidia (Clade) Williston 1913 [Laurin 1991]		Ref: M. Laurin, 1991: 83 ("araeoscelidians").
Archosauria (Clade) Cope 1869 [Gauthier & Padian 1985], nom. cl. inval.		Ref: M. Laurin, 1991: 83 ("archosaurs").
Lepidosauria (Clade) Haeckel 1866 [Gauthier, Estes & de Queiroz 1988], nom. cl. inval.		Ref: M. Laurin, 1991: 83 ("lepidosaurs").

Included, by definition, in node-based clade

Neodiapsida (Clade) Benton 1985

Ref: M. Laurin, 1991: 85 ("living diapsids").

Included, by definition, in branch-based clade

Neodiapsida (Clade) Benton 1985

Ref: M.J. Benton, 1985: 112 ("all diapsid reptiles").

Original entries

†Apsisaurus (Genus) Laurin, 1991		Ref: M. Laurin, 1991: 60.
†Araeoscelidia (Clade) Williston 1913 [Laurin 1991]		Ref: M. Laurin, 1991: 83, fig. 11.
Eosuchia (Clade) Broom 1914 [Laurin 1991]		Ref: M. Laurin, 1991: 83, fig. 11.

Current position

Romeriida ([unranked]) Gauthier, Kluge & Rowe, 1988

Ref: R.V. Hill, 2005: fig. 5.

Alternative positions

Eureptilia ([unranked]) Olson, 1947	Ref: M.J. Benton, 2004: fig. 1.2. [out of scope (coherent)]
Reptilia (Clade) Linnaeus 1758 [Gauthier 1984], nom. cl. inval.	Ref: J.S. Nelson, 2006: 467.

Historical positions

Reptilia (Clade) Linnaeus 1758 [Gauthier 1984], nom. cl. inval.	Ref: J.S. Nelson, 2006: 467.
Romeriida ([unranked]) Gauthier, Kluge & Rowe, 1988	Ref: R.V. Hill, 2005: fig. 5.
Eureptilia ([unranked]) Olson, 1947	Ref: M.J. Benton, 2004: fig. 1.2. [out of scope (coherent)]
Reptilia (Clade) Linnaeus 1758 [Gauthier 1984], nom. cl. inval.	Ref: M. Laurin, 1991: 83, fig. 11. [emended diagnosis] [inferred]

Number of Subtaxa

2025	Available in Systema Naturae 2000	35o;301f;3344g;20,060s;7724ss;1v;1; ‡2o;7f;60g;278s;65ss; †48o;304f;1534g;836s;3ss
1989-present	Systema Naturae 2000	[4c;35o;267f;3145g;17,872s]