PBDB Taxon

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Texoceros altidens

Mammalia - Antilocapridae

Taxonomy

Merycodus altidens was named by Matthew (1924). Its type locality is Aphelops Draw Quarries, which is in a Hemphillian terrestrial horizon in the Snake Creek Formation of Nebraska.

It was recombined as Capromeryx altidens by Hesse (1935), Hesse (1936) and Stirton (1938); it was recombined as Texoceros altidens by Frick (1937), Dalquest (1983) and Janis and Manning (1998).

Synonyms

Capromeryx texanus was named by Hesse (1935). Its type specimen is UCMP 30337, a mandible (lower left jaw), and it is a 3D body fossil. Its type locality is UCMP loc. V2832, Hemphill County 6, which is in a Hemphillian terrestrial sandstone/gravel in Texas.

It was recombined as Texoceros texanus by Frick (1937); it was synonymized subjectively with Texoceros altidens by Dalquest (1983) and Janis and Manning (1998).
Dorcameryx optimae was named by Reed and Longnecker (1928) [nomen nudum].

It was synonymized subjectively with Capromeryx altidens by Hesse (1936); it was considered a nomen nudum by Hesse (1935); it was synonymized subjectively with Texoceros altidens by Dalquest (1983) and Janis and Manning (1998).

Synonymy list

Year	Name and author
1924	Merycodus altidens Matthew
1928	Dorcameryx optimae Reed and Longnecker
1935	Capromeryx altidens Hesse p. 308
1935	Capromeryx texanus Hesse p. 311 figs. 4, 5B
1936	Capromeryx altidens Hesse
1937	Texoceros altidens Frick
1937	Texoceros texanus Frick
1938	Capromeryx altidens Stirton
1983	Texoceros altidens Dalquest
1998	Texoceros altidens Janis and Manning

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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	()
—	Mammaliamorpha
—	Mammaliaformes

Rank	Name	Author
class	Mammalia
—	Theriamorpha	(Rowe 1993)
—	Theriiformes	()
—	Trechnotheria
—	Cladotheria
—	Zatheria
subclass	Tribosphenida	()
subclass	Theria
—	Eutheria	()
—	Placentalia
—	Boreoeutheria
—	Laurasiatheria
—	Scrotifera
—	Euungulata
—	Artiodactylamorpha
—	Artiodactyla	()
—	Ruminantiamorpha
—	Ruminantia	(Scopoli 1777)
—	Pecora	()
family	Antilocapridae
genus	Texoceros
species	altidens	()

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.

†Texoceros altidens Matthew 1924

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Invalid names: Capromeryx texanus Hesse 1935 [synonym], Dorcameryx optimae Reed and Longnecker 1928 [synonym]

Diagnosis

Reference	Diagnosis
C. J. Hesse 1935 (Capromeryx texanus)	Intermediate in size between Merycodus necatus and Capromeryx altidens; jaw not shortened as in C. minor and C. mexicana (Chandler, 1916, p. 115); premolars not as high crowned as in the known species of Capromeryx, but higher crowned than in any described species of iMerycodus; ramus slender in outline as in Merycodus; but slightly larger.