Concise hierarchy

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

Included, by definition, in node-based clade

Australosphenida (Clade) Luo, Cifelli & Kielan-Jaworowska 2001		Ref: Z.-X. Luo et al., 2002: 22 ("monotremes").
Yinotheria (Clade) Chow & Rich 1982 [Kielan-Jaworowska, Cifelli & Luo 2004]		Ref: Z. Kielan-Jaworowska et al., 2004: table 1.1 (p. 14: "Crown Monotremata").

Subsequent positions

Australosphenida (Infraclass) Luo, Cifelli & Kielan-Jaworowska, 2001

Ref: Z.-X. Luo et al., 2001: 56.

Current position

Australosphenida (Clade) Luo, Cifelli & Kielan-Jaworowska 2001

Ref: A.O. Averianov & A.V. Lopatin, 2011: 34. [implicit]

Alternative positions

Australosphenida (Subclass) Luo, Cifelli & Kielan-Jaworowska, 2001	Ref: K.D. Rose, 2006: table 1.2 (p. [9]).
Australosphenida (Legion) Luo, Cifelli & Kielan-Jaworowska, 2001	Ref: A.O. Averianov & A.V. Lopatin, 2011: 34.
Mammalia (Class) Linnaeus, 1758	Ref: C.P. Groves, 1993: 13.
Ornithodelphia (Infraclass) (de Blainville, 1834)	Ref: A.F. DeBlase, 1982: 1015.
Prototheria (Subclass) Gill, 1872	Ref: C.J. Burgin et al., 2020: table 2 (p. 26).

Historical positions

Prototheria (Subclass) Gill, 1872	Ref: C.J. Burgin et al., 2020: table 2 (p. 26).
Prototheria (Subclass) Gill, 1872	Ref: C. Groves & D. Happold, 2013: 102.
Prototheria (Subclass) Gill, 1872	Ref: D.E. Wilson & D.M. Reeder, 2011: 56.
Australosphenida (Legion) Luo, Cifelli & Kielan-Jaworowska, 2001	Ref: A.O. Averianov & A.V. Lopatin, 2011: 34, fig.
Australosphenida (Subclass) Luo, Cifelli & Kielan-Jaworowska, 2001	Ref: K.D. Rose, 2006: tables 1.2 (p. [9]), 4.1, fig. 4.2.
Prototheria (Subclass) Gill, 1872	Ref: C.P. Groves, 2005: 1.
Australosphenida (Subclass) Luo, Cifelli & Kielan-Jaworowska, 2001	Ref: Z. Kielan-Jaworowska et al., 2004 (alt.): table 1.1 (p. 14).
Australosphenida (Subclass) Luo, Cifelli & Kielan-Jaworowska, 2001	Ref: Z. Kielan-Jaworowska et al., 2004: tables 1.2 (p. [17]), 6.1 (p. 206). [new position]
Mammalia (Class) Linnaeus, 1758	Ref: 1995
Mammalia (Class) Linnaeus, 1758	Ref: C.P. Groves, 1993: 13; 4.
Mammalia (Class) Linnaeus, 1758	Ref: G.B. Corbet & J.E. Hill, 1991: 9.
Mammalia (Class) Linnaeus, 1758	Ref: R.M. Nowak, 1991: 1.
Prototheria (Subclass) Gill, 1872	Ref: R.L. Carroll, 1988: 627.
Allotheria (Infraclass) (Marsh, 1880)	Ref: A.S. Romer & T.S. Parsons, 1986
Ornithodelphia (Infraclass) (de Blainville, 1834)	Ref: A.F. DeBlase, 1982: 1015.
Ornithodelphia (Infraclass) (de Blainville, 1834)	Ref: T.I. Storer et al., 1979
Ornithodelphia (Infraclass) (de Blainville, 1834)	Ref: M.C. McKenna, 1975: 40.
Prototheria (Subclass) Gill, 1872	Ref: W. Fiedler et al., 1973: [609].
Prototheria (Subclass) Gill, 1872	Ref: L.B. Halstead, 1974: 172.
Prototheria (Subclass) Gill, 1872	Ref: G.G. Simpson, 1945

Number of Subtaxa

2024	Available in Systema Naturae 2000	2f;3g;5s;9ss; †2f;6g;6s
1989-present	Systema Naturae 2000: 24 Jun 2022	[2f;3g;5s;9ss; †2f;6g]
2020	C.J. Burgin et al.: table 2 (p. 26)	[2f]
2011	D.E. Wilson & D.M. Reeder: 56	2f
2005	C.P. Groves	[2f;3g;5s;9ss]
1993	C.P. Groves	[2f];3g;3s
1991	R.M. Nowak	2f;3g;3s
1991	G.B. Corbet & J.E. Hill	[2f;3g];3s
1988	R.L. Carroll: 627	[2f]
1982	A.F. DeBlase	2f;[3g;4s]
1973	W. Fiedler et al.	2f;3g;6s