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Miohippus primus

Mammalia - Perissodactyla - Equidae

Taxonomy
Miohippus primus was named by Osborn (1918). Its type specimen is AMNH 7291, a partial skull (Fragmentary adult skull containing the superior grinding teeth, P3-M3), and it is a 3D body fossil. Its type locality is John Day (non-specific), which is in an Arikareean terrestrial horizon in the John Day Formation of Oregon.

Synonymy list
YearName and author
1918Miohippus primus Osborn p. 61 figs. Plates 3.13, 4.5. Text Fig. 39
1940Miohippus primus Stirton p. 172

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RankNameAuthor
kingdomAnimalia()
Bilateria
EubilateriaAx 1987
Life
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
speciesprimus

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 primus Osborn 1918
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Diagnosis
ReferenceDiagnosis
H. F. Osborn 1918 (Matthew, 1913) (1) An animal of smaller size than the types of M. anceps or M. annectens, of larger
size than the type of M. equiceps or M. brachylophus. (2) Premolars slightly broader transversely than molars, while in type of M. anceps they are narrower transversely than the molars; (3) vestigial internal cingulum; (4) no medivallum cusp;
(5) Protoloph interrupted by protoconule, metaloph continuous. (6) Lachrymal preorbital fossa moderate or shallow. (7) Compared with species·from the Protoceras zone of South Dakota, one-ninth larger than M. intermedim, premolars somewhat more crested and hypsodont, and of slightly greater transverse width. (8) As compared with type of M. gidleyi somewhat smaller in size, protocone and hypocone evenly developed.