Concise hierarchy

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

Included, by definition, in node-based clade

Trechnotheria (Clade) McKenna 1975

Ref: Z. Kielan-Jaworowska et al., 2004: table 1.1 (p. 14).

Excluded, by definition, from branch-based clade

Cladotheria (Clade) McKenna 1975

Ref: Z. Kielan-Jaworowska et al., 2004: 371.

Subsequent positions

†Spalacotherioidea (Order) Prothero, 1981

Original entries

Questionably †Microderson (Genus) Sigogneau-Russell, 1991
Questionably †Spalacotheridium (Genus) Cifelli, 1990
Questionably †Spalacotheroides (Genus) Patterson, 1955
Questionably †Symmetrodontoides (Genus) Fox, 1976

Subsequent entries

†Spalacotheriinae (Subfamily) Marsh, 1887		Ref: Cifelli & Madsen, 1999: 180.
†Spalacotherium (Genus) Owen, 1854		Ref: 1887 [assumed]

Current position

†Spalacotheriida (Order) Prothero, 1981

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

Alternative positions

†Spalacotherioidea (Superfamily) Marsh, 1887	Ref: Sweetman, 2008: 1370
†Spalacotherioidea (Order) Prothero, 1981	Ref: M.C. McKenna & S.K. Bell, 1997: 45; Zachos & Asher, 2018: 241.
†Symmetrodonta (Order) Simpson, 1925	Ref: R.L. Carroll, 1988: 627.
Trechnotheria (Clade) McKenna 1975	Ref: Z. Kielan-Jaworowska et al., 2004 (alt.): table 1.1 (p. 14); Han & Meng, 2016: 348, fig. 12.

Historical positions

Alethinotheria (Clade) Averianov, Martin & Lopatin 2013	Ref: A.O. Averianov et al., 2013: 321, fig. 2.
†Spalacotheriida (Order) Prothero, 1981	Ref: A.O. Averianov & A.V. Lopatin, 2011: fig. [implicit]
Trechnotheria (Clade) McKenna 1975	Ref: Z. Kielan-Jaworowska et al., 2004 (alt.): tables 1.1 (p. 14), 9.1 (p. 344).
Trechnotheria (Superlegion) McKenna, 1975	Ref: Z. Kielan-Jaworowska et al., 2004: table 9.2 (p. 345).
†Spalacotherioidea (Order) Prothero, 1981	Ref: M.C. McKenna & S.K. Bell, 1997: 45.
†Symmetrodonta (Order) Simpson, 1925	Ref: R.L. Carroll, 1988: 627.

Number of Subtaxa

2025	Available in Systema Naturae 2000	†10g;14s
1989-present	Systema Naturae 2000: 23 Mar 2022	[; †10g]
2004 (alt.)	Z. Kielan-Jaworowska et al.: table 9.1 (p. 344)	[; †7g]
2004	Z. Kielan-Jaworowska et al.: table 9.2 (p. 345)	[; †7g;14s]
1997	M.C. McKenna & S.K. Bell	[; †5g]