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Merychippus eohipparion

Mammalia - Perissodactyla - Equidae

Taxonomy
Merychippus eohipparion was named by Osborn (1918). Its type specimen is AMNH 9402, a partial skeleton (lower jaws, fore and hind limbs and feet, and several vertebrre, all belonging to a single individual), and it is a 3D body fossil.

It was recombined as Merychippus (Merychippus) eohipparion by Stirton (1940); it was considered a nomen dubium by Macdonald (1992).

Synonymy list
YearName and author
1918Merychippus eohipparion Osborn p. 117 figs. Plates 20.2, 44.3, 47.3, 49.3, 50.4,8, 54.3. Text Fig. 92
1940Merychippus (Merychippus) eohipparion Stirton p. 181

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RankNameAuthor
kingdomAnimalia()
—Bilateria
—EubilateriaAx 1987
—Deuterostomia
phylumChordataHaeckel 1874
subphylumVertebrata
superclassGnathostomata
—Osteichthyes()
subclassSarcopterygii()
subclassDipnotetrapodomorpha(Nelson 2006)
subclassTetrapodomorpha()
—Tetrapoda
—Reptiliomorpha
—Anthracosauria
subclassAmphibiosauriaKuhn 1967
—Cotylosauria()
—Amniota
subclassSynapsida
—Therapsida()
infraorderCynodontia()
—Mammaliamorpha
RankNameAuthor
—Mammaliaformes
classMammalia
—Cladotheria
—Zatheria
subclassTribosphenida()
subclassTheria
—Eutheria()
—Placentalia
—Boreoeutheria
—Laurasiatheria
—Scrotifera
—Euungulata
—Panperissodactyla
superorderPerissodactylamorpha
orderPerissodactyla()
superfamilyEquoidea
familyEquidae
subfamilyEquinae
genusMerychippus
specieseohipparion

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.

†Merychippus eohipparion Osborn 1918
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Diagnosis
ReferenceDiagnosis
H. F. Osborn 1918(Matthew, 1913) (1) Metaconid well separated from metastylid on P2; (2) metaconid-metastylid pillars
widely separated, deeply grooved in upper part o_f crown, flattening out at base of crown; (3) outer surface of protoconid and metaconid not flattened; (4) anterior ci,ngulum forming a prominent plate externally on lower half of tooth, wanting above; (5) heel of rna small toward crown, elongate toward the base, the crescents strongly recurved at inner side toward the base of tooth; (6) incisors large. (7) Antorbital region of skull moderately elongate. (8) Shaft of ulna moderately reduced, imperfectly united in the immature type; (9) metapodials long, lateral digits moderately reduced; (10) ungual phalanges narrow and short.
Measurements
No measurements are available
Composition: phosphaticsubp
Environment: terrestrialsubc
Locomotion: actively mobilec
Life habit: ground dwellingsubf
Diet: grazersubf
Diet 2: browsersubf
Reproduction: viviparoussubc
Created: 2005-08-31 14:56:53
Modified: 2005-08-31 16:56:53
Source: subf = subfamily, subc = subclass, c = class, subp = subphylum
References: MacFadden 1998, Ji et al. 2002, Hendy et al. 2009, Nowak 1991, Carroll 1988, Lillegraven 1979

Age range: Hemingfordian or 20.43000 to 15.97000 Ma

Collections: one only


Time interval Ma Country or state Original ID and collection number
Hemingfordian20.43 - 15.97USA (Colorado) Merychippus eohipparion (17908)