Concise hierarchy

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

Current position

Theria (Subclass) Parker & Haswell, 1897

Ref: C.J. Burgin et al., 2020: table 2 (p. 26).

Alternative positions

Boreosphenida (Subclass) Luo, Cifelli & Kielan-Jaworowska, 2001	Ref: K.D. Rose, 2006: table 1.2.
Theria (Clade) Parker & Haswell 1897 [McKenna 1975]	Ref: Burgin et al., 2020: table 2 (p. 26) [implicit]

Historical positions

Theria (Subclass) Parker & Haswell, 1897	Ref: C.J. Burgin et al., 2020: table 2 (p. 26).
Mammalia (Class) Linnaeus, 1758	Ref: S. Bi et al., 2018: fig. 4. [rough position]
Theria (Subclass) Parker & Haswell, 1897	Ref: C. Groves & D. Happold, 2013: 102.
Boreosphenida (Subclass) Luo, Cifelli & Kielan-Jaworowska, 2001	Ref: K.D. Rose, 2006: tables 1.2, 4.1, fig. 4.2.
Boreosphenida (Subclass) Luo, Cifelli & Kielan-Jaworowska, 2001	Ref: Z. Kielan-Jaworowska et al., 2004 (alt.): table 1.1 (p. 15).
Boreosphenida (Subclass) Luo, Cifelli & Kielan-Jaworowska, 2001	Ref: Z. Kielan-Jaworowska et al., 2004: tables 1.2 (p. [17]), 12.1 (p. [443]). [new position]
Theria of Metatherian-Eutherian grade ([unranked])	Ref: R.L. Carroll, 1988: 628.
Theria (Subclass) Parker & Haswell, 1897	Ref: A.S. Romer & T.S. Parsons, 1986
Theria (Subclass) Parker & Haswell, 1897	Ref: A.F. DeBlase, 1982: 1016.
Theria (Subclass) Parker & Haswell, 1897	Ref: L. Margulis & K.V. Schwartz, 1982: 239.
Theria (Subclass) Parker & Haswell, 1897	Ref: T.I. Storer et al., 1979
Theria (Subclass) Parker & Haswell, 1897	Ref: L.B. Halstead, 1974: 172.
Theria (Subclass) Parker & Haswell, 1897	Ref: G.G. Simpson, 1945

Number of Subtaxa

2024	Available in Systema Naturae 2000	7o;19f;90g;321s;207ss; ‡2f;3g;11s;2ss; †8o;48f;279g;106s;1ss
1989-present	Systema Naturae 2000: 25 Jun 2022	[7o;19f;90g;321s;207ss]
2020	C.J. Burgin et al.: table 2 (p. 26)	[7o;19f; ‡2f]
2013	C. Groves & D. Happold: 102	7o
1988	R.L. Carroll: 629	[1o;15f; ‡1f; †14f]
1982	A.F. DeBlase: 1016	1So;4o;[16f]
1945	G.G. Simpson:	[1o;8f]