Concise hierarchy

(Kingdom) Animalia - (Phylum) Chordata

Phylogeny

Crown clade

Ref: M.A. O'Leary et al., 2013: table S4 (p. 100: "Node-based crown clade").

First representative

†Dryolestida (Clade) Prothero 1981

Ref: M.A. O'Leary et al., 2013: table S2 (p. 85: "unnamed Dryolestida").

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

Monotremata (Clade) Bonaparte 1837 [Rowe 1988]		Ref: T. Rowe, 1988: 247.
Theria (Clade) Parker & Haswell 1897 [McKenna 1975]		Ref: T. Rowe, 1988: 247.

Included, by definition, in node-based clade

Amniota (Clade) Haeckel, 1866 [Gauthier, Kluge & Rowe 1988]		Ref: J. Gauthier et al., 1988b: 141 ("extant mammals").
Mammalia (Class) Linnaeus, 1758		Ref: Z. Kielan-Jaworowska et al., 2004: table 1.1 (p. 14: "Crown Mammalia").
Mammaliaformes (Clade) Rowe 1988		Ref: T. Rowe, 1988: 250.
Mammaliamorpha (Clade) Rowe 1988		Ref: T. Rowe, 1988: 249.
Zatheria (Clade) McKenna 1975		Ref: Z. Kielan-Jaworowska et al., 2004: table 1.1 (p. 14: "Crown Mammalia").

Included, by definition, in total clade

Synapsida (Clade) Osborn 1903 [Gauthier et al. 1989]

Ref: 340 ("mammals").

Node-based clade

Mammalia (Clade) Linnaeus 1758 [Rowe 1988], nom. cl. inval.		Ref: M.A. O'Leary et al., 2004: 494.
Mammalia (Class) Linnaeus, 1758		Ref: M.C. McKenna & S.K. Bell, 1997: [35] (note 1).

Original position

Mammaliaformes (Clade) Rowe 1988

Ref: T. Rowe, 1988: 250, figs. 3, 4.

Subsequent entries

Theriimorpha (Clade) Rowe 1993

Ref: T. Rowe, 1993: fig. 10.2.

Current position

Mammaliaformes (Clade) Rowe 1988

Ref: M.A. O'Leary et al., 2013: table S4 (p. 100).

Alternative positions

Eucynodontia (Clade) Kemp 1982 [Rowe 1993]

Ref: M.J. Benton, 2005: 290. [inferred rank]

Historical positions

Mammaliaformes (Clade) Rowe 1988	Ref: M.A. O'Leary et al., 2013: table S4 (p. 100).
Synapsida (Clade) Osborn 1903 [Gauthier et al. 1989]	Ref: J.S. Nelson, 2006: 467. [rough position]
Tetrapoda (Clade) Hatschek & Cori 1896 [Gauthier, Kluge & Rowe 1988]	Ref: N. Iwabe et al., 2005: fig. 1c. [indirect]
Mammaliaformes (Clade) Rowe 1988	Ref: M.A. O'Leary et al., 2004: fig. 28.2.
Mammaliaformes (Clade) Rowe 1988	Ref: T. Rowe, 1988: 251-255, figs. 3, 4. [new position]

Number of Subtaxa

2025

Available in Systema Naturae 2000

†1g