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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
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()
Triploblastica
Nephrozoa
Deuterostomia
phylumChordataHaeckel 1847
OlfactoresJefferies 1991
subphylumVertebrata
Gnathostomata()
Osteichthyes()
Sarcopterygii
subclassDipnotetrapodomorpha(Nelson 2006)
subclassTetrapodomorpha()
Tetrapoda()
Reptiliomorpha
Anthracosauria
Batrachosauria()
Cotylosauria()
Amniota
Synapsida()
Therapsida()
RankNameAuthor
infraorderCynodontia()
Epicynodontia
infraorderEucynodontia
Probainognathia
Mammaliamorpha
Mammaliaformes
classMammalia
subclassTribosphenida()
infraclassEutheria()
Placentalia
orderPerissodactyla()
suborderLophodontomorpha
infraorderEuperissodactyla
Hippomorpha
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.

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.