PBDB Taxon

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Trachytherus

Mammalia - Notoungulata - Mesotheriidae

Taxonomy

Trachytherus was named by Ameghino (1889). It is not extant.

It was replaced with Eutrachytherus by Ameghino (1897).

It was assigned to Trachytheridae by Ameghino (1894); to Typotheriidae by Lydekker (1894); to Trachytherinae by Simpson et al. (1962); to Trachytheriinae by Shockey et al. (2009) and Reguero and Prevosti (2010); and to Mesotheriidae by Simpson and Minoprio (1949), Carroll (1988) and Cerdeño (2014).

Species

Eutrachytherus modestus, T. alloxus, T. ramirezi, T. spegazzinianus (syn. Anatrachytherus soriai, Ameghinotherium curuzucuatiense, Coresodon cancellatus, Eutrachytherus grandis, Proedium solitarium, T. conturbatus), T. subandinus

Synonyms

Eutrachytherus was named by Ameghino (1897). Its type is Trachytherus spegazzinianus. It is the type genus of Eutrachytheriidae.

It was synonymized objectively with Trachytherus by Billet et al. (2008).

It was assigned to Eutrachytheriidae by Ameghino (1897).
Isoproedrium was named by Ameghino (1904).

It was synonymized subjectively with Trachytherus by Billet et al. (2008).

It was assigned to Eutrachytheridae by Ameghino (1904).
Ameghinotherium was named by Podestá (1899).

It was synonymized subjectively with Trachytherus by Billet et al. (2008).
Anatrachytherus was named by Reguero and Castro (2004).

It was synonymized subjectively with Trachytherus by Billet et al. (2008).

It was assigned to Trachytheriinae by Reguero and Castro (2004).
Proedium was named by Ameghino (1895).

It was replaced with Isoproedrium by Ameghino (1904); it was synonymized subjectively with Trachytherus by Billet et al. (2008).

It was assigned to Eutrachytheriidae by Ameghino (1897); and to Mesotheriidae by Carroll (1988).

Synonymy list

Year	Name and author
1889	Trachytherus Ameghino
1894	Trachytherus Ameghino p. 20
1894	Trachytherus Lydekker p. 1
1895	Proedium Ameghino pp. 623-624
1897	Eutrachytherus Ameghino p. 427
1897	Proedrium Ameghino p. 429
1899	Ameghinotherium Podestá pp. 1-8
1904	Isoproedrium Ameghino p. 28
1949	Trachytherus Simpson and Minoprio
1962	Trachytherus Simpson et al.
1988	Proedium Carroll
1988	Trachytherus Carroll
2004	Anatrachytherus Reguero and Castro
2009	Trachytherus Shockey et al.
2010	Trachytherus Reguero and Prevosti
2014	Trachytherus Cerdeño

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Rank	Name	Author
kingdom	Animalia	()
—	Bilateria
—	Eubilateria	Ax 1987
—	Deuterostomia
phylum	Chordata	Haeckel 1874
subphylum	Vertebrata
superclass	Gnathostomata
—	Osteichthyes	()
subclass	Sarcopterygii	()
subclass	Dipnotetrapodomorpha	(Nelson 2006)
subclass	Tetrapodomorpha	()
—	Tetrapoda
—	Reptiliomorpha
—	Anthracosauria
subclass	Amphibiosauria	Kuhn 1967
—	Cotylosauria	()
—	Amniota
subclass	Synapsida
—	Therapsida	()
infraorder	Cynodontia	()

Rank	Name	Author
—	Mammaliamorpha
—	Mammaliaformes
class	Mammalia
—	Theriamorpha	(Rowe 1993)
—	Theriiformes	()
—	Trechnotheria
—	Cladotheria
—	Zatheria
subclass	Tribosphenida	()
subclass	Theria
—	Eutheria	()
—	Placentalia
—	Afrotheria	Stanhope et al. 1998
—	Paenungulatomorpha
—	Paenungulata	Simpson 1945
—	Sudamericungulata
order	Notoungulata
suborder	Typotheria	Zittel 1892
family	Mesotheriidae	Alston 1876
genus	Trachytherus	Ameghino 1889

If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.

G. †Trachytherus Ameghino 1889

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Trachytherus alloxus Billet et al. 2008

†Trachytherus ramirezi Shockey et al. 2016

†Trachytherus spegazzinianus Ameghino 1889

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Invalid names: Ameghinotherium curuzucuatiense Podestá 1899 [synonym], Anatrachytherus soriai Reguero and Castro 2004 [synonym], Coresodon cancellatus Ameghino 1901 [synonym], Eutrachytherus grandis Loomis 1914 [objective synonym], Proedium solitarium Ameghino 1894 [synonym], Trachytherus conturbatus Ameghino 1891 [synonym]

†Trachytherus subandinus Villarroel A. et al. 1994

Invalid names: Ameghinotherium Podestá 1899 [synonym], Anatrachytherus Reguero and Castro 2004 [synonym], Eutrachytherus Ameghino 1897 [objective synonym], Isoproedrium Ameghino 1904 [synonym], Proedium Ameghino 1895 [synonym]

Diagnosis

Reference	Diagnosis
M. A. Reguero and P. V. Castro 2004 (Anatrachytherus)	traquiterino de tamaño intermedio entre Trachytherus? mendocensis Simpson y Monoprio y Trachytherus spegazzinianus Ameghino. Fórmula dentaria más completa, I ?/2 C ?/1 P ?/4 M ?/3, que la de Trachytherus (I 3/2 C 0/0 P 3/3 M 3/ 3). Relación m2/m3 ca. 1. Mandíbula más corta y sínfisis menos procumbente que la deTrachytherus.