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Mesohippus latidens

Mammalia - Perissodactyla - Equidae

Taxonomy
Mesohippus latidens was named by Douglass (1903). Its type specimen is CM 751, a set of teeth (four superior grinders, P4-M3, of the left side), and it is a 3D body fossil. Its type locality is Thompson Creek, which is in a Chadronian terrestrial claystone in Montana.

It was synonymized subjectively with Mesohippus bairdi by Forsten (1970).

Synonymy list
YearName and author
1903Mesohippus latidens Douglass
1904Mesohippus latidens Osborn p. 170
1918Mesohippus latidens Osborn p. 39 figs. Text Fig. 19
1940Mesohippus latidens Stirton p. 170
1998Mesohippus latidens MacFadden p. 543

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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
subfamilyAnchitheriinae()
genusMesohippus
specieslatidens

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.

†Mesohippus latidens Douglass 1903
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Diagnosis
ReferenceDiagnosis
H. F. Osborn 1918(Douglass, 1903, p. 161) "The most striking distinguishing character of the teeth is the extreme
transverse as compared with the antero-posterior diameter and much greater width of the anterior than of the posterior portions." (Osborn, 1904) Much more progressive than M. westoni; protoloph and metaloph more elevated; internal cingulum not continuous; hypostyle wanting; distinguished from M. westoni and M. celer by prominent parastyle and elongate protoloph so that anterior half of the crown is much broader than the posterior half.
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: Nowak 1991, Hendy et al. 2009, Lillegraven 1979, Carroll 1988, Ji et al. 2002

Age range: Chadronian or 37.20000 to 33.90000 Ma

Collections: one only


Time interval Ma Country or state Original ID and collection number
Chadronian37.2 - 33.9USA (Montana) Mesohippus latidens (type locality: 17028)