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Miohippus primus
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 Units G, H, I, and J, which is in a Geringian terrestrial horizon in the John Day Formation of Oregon.
Sister species lacking formal opinion data
Synonymy list
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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
| Reference | Diagnosis | |
|---|---|---|
| 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. |
Measurements
No measurements are available
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| Source: f = family, subc = subclass, c = class, subp = subphylum | |||||
| References: Hendy et al. 2009, Lillegraven 1979, Nowak 1991, Ji et al. 2002, Carroll 1988 | |||||