Concise hierarchy

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

Phylogeny

Node-based clade

Ref: P.C. Sereno, 1998: table 4 (p. 65).

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

Neornithes (Clade) Gadow, 1893		Ref: P.C. Sereno, 1998: table 4 (p. 65).
†Sinornis (Genus) Sereno & Rao, 1992		Ref: P.C. Sereno, 1998: table 4 (p. 65).

Generic clade

Ornithothoraces (Clade) Chiappe 1995

Ref: P.C. Sereno, 1998: table 4 (p. 65).

Current position

Pygostylia (Clade) Chatterjee 1997 [Chiappe 2001]

Ref: J.K. O'Connor et al., 2010: fig. 9.

Alternative positions

Ornithurae (Clade) Haeckel 1866 [Gauthier 1986] {Chiappe 1991}

Ref: P.C. Sereno, 1998: table 4 (p. 65).

Historical positions

Pygostylia (Clade) Chatterjee 1997 [Chiappe 2001]	Src: J.K. O'Connor et al., 2010: fig. 9.
Pygostylia (Clade) Chatterjee 1997 [Chiappe 2001]	Src: K. Padian, 2004: table 11.1 (p. [212]), fig. 11.8.
Pygostylia (Clade) Chatterjee 1997 [Chiappe 2001]	Src: L.M. Chiappe, 2001: [126] (fig. 1).
Ornithurae (Clade) Haeckel 1866 [Gauthier 1986] {Chiappe 1991}	Src: P.C. Sereno, 1998: table 4 (p. 65), fig. 9B.

Number of Subtaxa

2024	Available in Systema Naturae 2000	31o;202f;2151g;9617s;7150ss;1v; ‡2o;7f;57g;261s;62ss; †23o;86f;344g;154s;3ss
1989-present	Systema Naturae 2000	[31o;201f;2135g;9609s]