PBDB Taxon

Basic info	Taxonomic history	Classification	Included Taxa
Morphology	Ecology and taphonomy	External Literature Search	Age range and collections

Heteromeryx

Mammalia - Protoceratidae

Taxonomy

Heteromeryx was named by Matthew (1905). It is not extant.

It was assigned to Hypertragulidae by Matthew (1905); to Leptomerycinae by Scott (1940); and to Protoceratidae by Carroll (1988), Prothero (1998), Prothero and Ludtke (2007).

Species

H. dispar

Synonymy list

Year	Name and author
1905	Heteromeryx Matthew
1940	Heteromeryx Scott p. 554
1988	Heteromeryx Carroll
1998	Heteromeryx Prothero p. 434
2007	Heteromeryx Prothero and Ludtke p. 172

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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	()

Rank	Name	Author
infraorder	Cynodontia	()
—	Mammaliamorpha
—	Mammaliaformes
class	Mammalia
—	Cladotheria
—	Zatheria
subclass	Tribosphenida	()
subclass	Theria
—	Eutheria	()
—	Placentalia
—	Boreoeutheria
—	Laurasiatheria
—	Scrotifera
—	Euungulata
—	Artiodactylamorpha
—	Artiodactyla	()
—	Ruminantiamorpha
family	Protoceratidae
genus	Heteromeryx

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. †Heteromeryx Matthew 1905

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†Heteromeryx dispar Matthew 1905

Diagnosis

Reference	Diagnosis
W. D. Matthew 1905	Skull rather short, orbits complete behind, situate over the posterior molars, muzzle elongate, nasals considerably reduced. Teeth very short crowned, molars with heavy internal cingula and rudimentary mesos1!yle. Four premolars, the first small, simple, with lol)g diastemata before and behind it, the others much as in Leptomeryx . Ulna with well-developed shaft, co- ossified with radius along its entire length. Manus functionally tetradactyl, with four separate digits as in Leptomeryx. Magnum and cuneiform fused. Distal end of fibula separate from tibia; shaft a small vestigial spine. Pes didactyl, with separate metatarsals, cuboid and navicular distinct, ecto- and meso-cuneiform fused. Ungual phalanges short and compressed.

Measurements

No measurements are available

Composition:

phosphaticsubp

Environment:

terrestrialo

Locomotion:

actively mobilec

Life habit:

ground dwellingf

Diet:

browserf

Reproduction:

viviparoussubc

Created:

2005-08-31 14:39:46

Modified:

2009-01-07 18:24:42

Source: f = family, o = order, subc = subclass, c = class, subp = subphylum

References: Nowak 1999, Hendy et al. 2009, Carroll 1988, Lillegraven 1979, Prothero 1998

Age range: base of the Chadronian to the top of the Duchesnean or 37.20000 to 37.00000 Ma

Collections (5 total)

Time interval	Ma	Country or state	Original ID and collection number
Duchesnean	39.7 - 37.0	USA (Texas)	H. dispar (16829 16830)
Chadronian	37.2 - 33.9	USA (Nebraska)	H. dispar (16941)
Chadronian	37.2 - 33.9	USA (South Dakota)	H. dispar (16969 16978)