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Orohippus major
Taxonomy
Orohippus major was named by Marsh (1874). Its type specimen is YPM 11270, a maxilla (fragment of right maxilla with M2 and M3, and loose M2), and it is a 3D body fossil. Its type locality is Millersville, which is in a Bridgerian terrestrial horizon in the Bridger Formation of Wyoming.
It was recombined as Pliolophus major by Osborn (1890); it was recombined as Hyracotherium major by Stucky (1984).
It was recombined as Pliolophus major by Osborn (1890); it was recombined as Hyracotherium major by Stucky (1984).
Synonymy list
| Year | Name and author |
|---|---|
| 1874 | Orohippus major Marsh p. 248 |
| 1875 | Orohippus major Cope p. 21 |
| 1890 | Pliolophus major Osborn |
| 1898 | Orohippus major Trouessart |
| 1899 | Orohippus major Matthew |
| 1902 | Orohippus major Hay p. 611 |
| 1908 | Orohippus major Granger |
| 1930 | Orohippus major Hay |
| 1940 | Orohippus major Stirton |
| 1957 | Orohippus major Kitts p. 7 |
| 1984 | Hyracotherium major Stucky |
| 1998 | Orohippus major MacFadden p. 543 |
| 2002 | Orohippus major Froehlich p. 151 |
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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.
†Orohippus major Marsh 1874
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| D. B. Kitts 1957 | Length of M2, 9.3 mm. Mean length of M3, 12.90 mm. (two specimens).Mesostyle weak. Heel of M3 broad and relatively long. In the original description O. major was distinguished from other species of the genus on the basis of its large size and because, in the words of Marsh, "the intermediate lobes of the molars are les well developed and the antero-posterior buttress is more elevated." |
Measurements
No measurements are available
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| Source: f = family, subc = subclass, c = class, subp = subphylum | |||||
| References: Ji et al. 2002, Nowak 1991, Lillegraven 1979, Hendy et al. 2009, Carroll 1988 | |||||
Age range: Bridgerian or 50.30000 to 46.20000 Ma
Collections: one only
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Bridgerian | USA (Wyoming) | Orohippus major (type locality: 16284) |