Concise hierarchy

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

Phylogeny

Node-based clade		Ref: M.C. McKenna, 1975: 25.
Reference phylogeny [PhyloCode]		Ref: M.C. McKenna, 1975: fig. 1. [implicit]

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

Cladotheria (Clade) McKenna 1975		Ref: M.C. McKenna, 1975: 25.
†Symmetrodonta (Legion) Simpson, 1925		Ref: M.C. McKenna, 1975: 25; 27.

Branch-based clade

Trechnotheria (Clade) McKenna 1975

Ref: A.O. Averianov et al., 2013: 321.

Node-based clade

Trechnotheria (Clade) McKenna 1975		Ref: Z. Kielan-Jaworowska et al., 2004: table 1.1 (p. 14).
Trechnotheria (Clade) McKenna 1975		Ref: Z.-X. Luo et al., 2002: 26. [inferred]

Current position

Theriiformes (Clade) Rowe 1988

Ref: M.J. Benton, 2005: 400; Bi et al., 2014: fig. 4. [inferred rank] [implicit]

Alternative positions

Acrotheria (Subclass) Averianov & Lopatin, 2011	Ref: A.O. Averianov & A.V. Lopatin, 2011: fig. [new position]
Mammalia (Class) Linnaeus, 1758	Ref: Z. Kielan-Jaworowska et al., 2004 (alt.): table 1.1 (p. 14).

Historical positions

Mammalia (Clade) Linnaeus 1758 [Rowe 1988], nom. cl. inval.	Ref: A.O. Averianov et al., 2013: 321, fig. 2. [inferred]
Acrotheria (Subclass) Averianov & Lopatin, 2011	Ref: A.O. Averianov & A.V. Lopatin, 2011: fig. [new position]
Mammalia (Class) Linnaeus, 1758	Ref: Z. Kielan-Jaworowska et al., 2004 (alt.): tables 1.1 (p. 14), 9.1 (p. 344).

Number of Subtaxa

2025	Available in Systema Naturae 2000	26o;163f;1202g;5115s;4347ss;302v; ‡12f;52g;110s;33ss;1v; †39o;320f;4274g;1530s;65ss;1v
1989-present	Systema Naturae 2000	[26o;135f; ‡1o;10f;52g; †36o;299f;4343g]