PBDB Taxon

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Isotemnus

Mammalia - Notoungulata - Isotemnidae

Taxonomy

Isotemnus was named by Ameghino (1897). Its type is Isotemnus primitivus.

It was assigned to Isotemnidae by Ameghino (1897), Simpson (1935), Simpson (1967) and Carroll (1988).

Species

I. colhuehuapiensis, I. ctalego, I. haugi, I. latidens (syn. I. enecatus, I. cuspidatus, Eochalicotherium robustum, Eochalicotherium crassidens, I. apicatus), I. primitivus (syn. I. conspiquus, Eochalicotherium cretaceum, Trimerostephanos angustus, Amphitemnus nucleatus, Amphitemnus transitorius) (type species), Prostylops typus

Species lacking formal opinion data

I. consummatus

Synonyms

Prostylops was named by Ameghino (1897). Its type is Prostylops typus.

It was synonymized subjectively with Isotemnus by Simpson (1967).

It was assigned to Isotemnidae by Ameghino (1897).
Prostylops typus was named by Ameghino (1897). It is a 3D body fossil. Its type locality is Casamayoran of Patagonia, which is in a Casamayoran terrestrial horizon in Argentina. It is the type species of Prostylops.

It was considered a nomen dubium by Simpson (1967).
Dimerostephanos was named by Ameghino (1902).

It was synonymized subjectively with Isotemnus by Simpson (1967).

It was assigned to Isotemnidae by Ameghino (1902).
Dimerostephanos colhuehuapensis was named by Ameghino (1902). It is a 3D body fossil. Its type locality is Barranca south of Lago Colhue-Huapi, Gran Barranca, which is in a Bartonian terrestrial claystone in the Sarmiento Formation of Argentina.

It was considered a nomen vanum by Simpson (1967).
Amphitemnus was named by Ameghino (1904).

It was synonymized subjectively with Isotemnus by Simpson (1967).

It was assigned to Isotemnidae by Ameghino (1904).
Lelfunia was named by Roth (1902). Its type is Lelfunia haugi.

It was synonymized subjectively with Isotemnus by Simpson (1967).
Eochalicotherium was named by Ameghino (1901).

It was synonymized subjectively with Isotemnus by Simpson (1935) and Simpson (1967).

It was assigned to Isotemnidae by Ameghino (1901).

Synonymy list

Year	Name and author
1897	Isotemnus Ameghino p. 480
1897	Prostylops Ameghino p. 486
1897	Prostylops typus Ameghino p. 486
1901	Eochalicotherium Ameghino p. 420
1902	Dimerostephanos Ameghino p. 30
1902	Dimerostephanos colhuehuapensis Ameghino p. 30
1902	Lelfunia Roth p. 255
1904	Amphitemnus Ameghino p. 86
1935	Isotemnus Simpson p. 15
1967	Isotemnus Simpson
1988	Isotemnus Carroll

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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	Toxodontia	Ameghino 1887
family	Isotemnidae
genus	Isotemnus

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. †Isotemnus Ameghino 1897

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†Isotemnus ctalego Simpson 1935

†Isotemnus haugi Roth 1902

†Isotemnus latidens Ameghino 1901

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Invalid names: Eochalicotherium crassidens Ameghino 1901 [synonym], Eochalicotherium robustum Ameghino 1901 [synonym], Isotemnus apicatus Ameghino 1901 [synonym], Isotemnus cuspidatus Ameghino 1901 [synonym], Isotemnus enecatus Ameghino 1901 [synonym]

†Isotemnus primitivus Ameghino 1897

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Invalid names: Amphitemnus nucleatus Ameghino 1904 [synonym], Amphitemnus transitorius Ameghino 1904 [synonym], Eochalicotherium cretaceum Ameghino 1901 [synonym], Isotemnus conspiquus Ameghino 1897 [synonym], Trimerostephanos angustus Ameghino 1897 [synonym]

Invalid names: Amphitemnus Ameghino 1904 [synonym], Dimerostephanos Ameghino 1902 [synonym], Eochalicotherium Ameghino 1901 [synonym], Isotemnus colhuehuapiensis Ameghino 1902 [nomen vanum], Lelfunia Roth 1902 [synonym], Prostylops Ameghino 1897 [synonym], Prostylops typus Ameghino 1897 [nomen dubium]

Diagnosis

No diagnoses are available