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Miohippus intermedius

Mammalia - Perissodactyla - Equidae

Taxonomy
Mesohippus intermedius was named by Osborn and Wortman (1895). Its type specimen is AMNH 1196, a partial skeleton (skull and parts of skeleton), and it is a 3D body fossil. Its type locality is Indian Stronghold (Protoceras Channel), which is in a Whitneyan fluvial sandstone in the Brule Formation of South Dakota.

It was recombined as Pediohippus intermedius by Schlaikjer (1935) and Scott (1941); it was recombined as Miohippus intermedius by Hay (1902), Osborn (1918), Sinclair (1925), Hay (1930), Stock (1933), Stirton (1940), Macdonald (1951), Prothero and Shubin (1989) and MacFadden (1998).

Synonymy list
YearName and author
1895Mesohippus intermedius Osborn and Wortman
1902Miohippus intermedius Hay p. 614
1904Mesohippus intermedius Osborn p. 176
1918Miohippus intermedius Osborn p. 54 figs. Plates 1.9, 3.3. Text Fig. 32
1925Miohippus intermedius Sinclair
1930Miohippus intermedius Hay
1933Miohippus intermedius Stock
1935Pediohippus intermedius Schlaikjer p. 145
1940Miohippus intermedius Stirton p. 172
1941Pediohippus intermedius Scott
1951Miohippus intermedius Macdonald
1989Miohippus intermedius Prothero and Shubin
1998Miohippus intermedius MacFadden p. 544

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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
Mammaliaformes
RankNameAuthor
classMammalia
Theriamorpha(Rowe 1993)
Theriiformes()
Trechnotheria
Cladotheria
Zatheria
subclassTribosphenida()
subclassTheria
Eutheria()
Placentalia
Boreoeutheria
Laurasiatheria
Scrotifera
Euungulata
Panperissodactyla
superorderPerissodactylamorpha
orderPerissodactyla()
superfamilyEquoidea
familyEquidae
subfamilyAnchitheriinae()
genusMiohippus
speciesintermedius()

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.

Miohippus intermedius Osborn and Wortman 1895
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Diagnosis
ReferenceDiagnosis
H. F. Osborn 1918(Osborn and Wortman, 1895, Osborn, 1918) (1) Skull with large and apparently undivided lachrymornalar fossa of the shallow vertically broad type: (2) cranial exceeds facial length. (3) Premolars 3-4 exceeding molars in width; (4) premolars 2-4 exceeding molars 1-3 in length; (5) molars bunoselenodont in lophs interrupted, protocone large; (6) hypostyle separate and distinct or only slightly connected with posterior cingulum, in some speci- mensl(e. g. American Museum 1043) still partly connected. Despite the foregoing progressive characters, (7) protoloph decidedly interrupted by protoconule; (8) molars more brachyodont than in M. meteulophus; (9) parastyle broad and rounded when worn, as in M. brachyatylus and M. bairdii. (10) A characteristic feature of this species is the long and rather slender metapodials combined with short phalanges; leads up into Kalobatippus.
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: Carroll 1988, Nowak 1991, Lillegraven 1979, Ji et al. 2002, Hendy et al. 2009

Age range: base of the Whitneyan to the top of the Geringian or 33.30000 to 26.30000 Ma

Collections (6 total)


Time interval Ma Country or state Original ID and collection number
Whitneyan33.3 - 30.8USA (South Dakota) Mesohippus intermedius (type locality: 17344)
Whitneyan - Monroecreekian33.3 - 24.8Canada (Saskatchewan) Miohippus intermedius (17306)
Geringian30.8 - 26.3USA (Nebraska) Miohippus intermedius (17494 17495)
Geringian30.8 - 26.3USA (Oregon) Miohippus intermedius (17537)
Arikareean30.8 - 20.43USA (Nebraska) Miohippus intermedius (17568)