Concise hierarchy

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

Subsequent positions

Theria (Supercohort) Parker & Haswell, 1897

Ref: M.C. McKenna & S.K. Bell, 1997: 50.

Original entries

Questionably †Deltatheroididae (Family) Kielan-Jaworowska & Nessov, 1990
Questionably †Khuduklestes (Genus) Nessov, Sigogneau-Russell & Russell, 1994
Questionably †Oxlestes (Genus) Nessov, 1982

Subsequent entries

†Deltatheridiidae (Family) Gregory & Simpson, 1926

Current position

Metatheria (Infraclass) Huxley, 1880

Ref: K.D. Rose, 2006: table 1.2; Oliveira et al., 2021: fig. 6.

Alternative positions

Boreosphenida (Sublegion) Luo, Cifelli & Kielan-Jaworowska, 2001	Ref: M.J. Benton, 2005: 400.
Metatheria (Supercohort) Huxley, 1880	Ref: M.J. Benton, 2015: 443.
Theria (Supercohort) Parker & Haswell, 1897	Ref: M.C. McKenna & S.K. Bell, 1997: 50. [new position]

Historical positions

Metatheria (Clade) Huxley 1880 [O'Leary, Allard, Novacek, Meng & Gatesy 2004]	Ref: L.M. Carneiro et al., 2018: fig. 5. [inferred rank]
Metatheria (Infraclass) Huxley, 1880	Ref: S. Bi et al., 2018: fig. 4.
Metatheria (Supercohort) Huxley, 1880	Ref: M.J. Benton, 2015: 443.
Metatheria (Infraclass) Huxley, 1880	Ref: K.D. Rose, 2006: table 1.2.
Boreosphenida (Sublegion) Luo, Cifelli & Kielan-Jaworowska, 2001	Ref: M.J. Benton, 2005: 400, box 10.3.
Theria (Supercohort) Parker & Haswell, 1897	Ref: M.C. McKenna & S.K. Bell, 1997: 50-51. [new position]

Number of Subtaxa

2025	Available in Systema Naturae 2000	†1f;10g;7s
1989-present	Systema Naturae 2000: 27 Mar 2022	[; †1f;10g]
1997	M.C. McKenna & S.K. Bell	[; †2f;5g]