PBDB Taxon

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

Eohippus

Mammalia - Perissodactyla - Equidae

Taxonomy

Eohippus was named by Marsh (1876).

It was synonymized subjectively with Hyracotherium by Wortman (1896), Trouessart (1898), Matthew (1899), Kitts (1956), Toohey (1959), Schiebout (1974), Gingerich (1991) and MacFadden (1998).

It was assigned to Hyracotheriinae by Hay (1902); and to Equidae by Marsh (1876), Granger (1908), Scott (1913), Stirton (1940), Froehlich (1999) and Froehlich (2002).

Species

E. angustidens (syn. Hyracotherium seekinsi, E. validus, Hyracotherium cuspidatum), E. borealis, E. cristonensis, E. resartus

Synonymy list

Year	Name and author
1876	Eohippus Marsh p. 401
1902	Eohippus Hay p. 608
1908	Eohippus Granger
1913	Eohippus Scott p. 290
1940	Eohippus Stirton
1999	Eohippus Froehlich
2002	Eohippus Froehlich p. 159 fig. 1

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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
—	Cladotheria
—	Zatheria
subclass	Tribosphenida	()
subclass	Theria
—	Eutheria	()
—	Placentalia
—	Boreoeutheria
—	Laurasiatheria
—	Scrotifera
—	Euungulata
—	Panperissodactyla
superorder	Perissodactylamorpha
order	Perissodactyla	()
superfamily	Equoidea
family	Equidae
genus	Eohippus

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. †Eohippus Marsh 1876

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†Eohippus angustidens Cope 1875

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Invalid names: Eohippus validus Marsh 1876 [synonym], Hyracotherium cuspidatum Cope 1875 [synonym], Hyracotherium seekinsi Morris 1968 [synonym]

†Eohippus borealis Granger 1908

†Eohippus cristonensis Cope 1877

†Eohippus resartus Granger 1908

Diagnosis

No diagnoses are available

Measurements

No measurements are available

Composition:

phosphaticsubp

Environment:

terrestrialsubc

Locomotion:

actively mobilec

Life habit:

ground dwellingf

Diet:

browserf

Reproduction:

viviparoussubc

Created:

2005-06-08 10:11:09

Modified:

2005-08-31 16:55:50

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

References: Hendy et al. 2009, Carroll 1988, Lillegraven 1979, Ji et al. 2002, Nowak 1991

Age range: Wasatchian or 55.80000 to 50.30000 Ma

Collections (5 total)

Time interval	Ma	Country or state	Original ID and collection number
Wasatchian	55.8 - 50.3	Mexico (Baja California)	E. angustidens, Hyracotherium sp. (15671)
Wasatchian	55.8 - 50.3	USA (New Mexico)	Hipposyus sp. (15430) Hyracotherium vasacciense (15663)
Wasatchian	55.8 - 50.3	USA (Colorado)	E. angustidens (15655) Hyracotherium vasacciense (15652)