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Orohippus agilis
Taxonomy
Orohippus agilis was named by Marsh (1873). Its type specimen is YPM 1268, a partial skeleton (fragmentary skull, forelimb, and vertebrae), and it is a 3D body fossil. Its type locality is Henry's Fork, which is in an Eocene terrestrial horizon in the Bridger Formation of Wyoming.
It was recombined as Hyracotherium agile by Cope (1877); it was recombined as Epihippus agilis by Osborn (1890).
It was recombined as Hyracotherium agile by Cope (1877); it was recombined as Epihippus agilis by Osborn (1890).
Synonymy list
| Year | Name and author |
|---|---|
| 1873 | Orohippus agilis Marsh p. 407 |
| 1874 | Orohippus agilis Marsh p. 249 |
| 1875 | Orohippus agilis Cope p. 22 |
| 1877 | Hyracotherium agile Cope |
| 1890 | Epihippus agilis Osborn |
| 1892 | Orohippus agilis Marsh |
| 1899 | Orohippus agilis Matthew |
| 1902 | Orohippus agilis Hay p. 611 |
| 1908 | Orohippus agilis Granger p. 228 |
| 1940 | Orohippus agilis Stirton |
| 1957 | Orohippus agilis Kitts p. 28 |
| 1998 | Orohippus agilis MacFadden p. 543 |
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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 agilis Marsh 1873
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| D. B. Kitts 1957 | No diastema between P1 and P2. P2 triangular, with small internal cusp. P4 fully molariform but with lateral border parallel to edge of palate. P3 like P4 but narrower internally than externally. Paraconule and metaconule of molars les prominent than in other species. Mesoloph strong. Ectoloph rises to points of external cusps. Ectoloph V about 90 degrees. P4 and lower molars with anterior cusps much closer together than posterior cusps. P4, M1, and M2 wider posteriorly than anteriorly. P4 widest tooth of lower series. Heel of m3 short and relatively broad. |
Measurements
No measurements are available
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| Source: f = family, subc = subclass, c = class, subp = subphylum | |||||
| References: Carroll 1988, Ji et al. 2002, Lillegraven 1979, Hendy et al. 2009, Nowak 1991 | |||||
Age range: Middle Eocene or 47.80000 to 37.71000 Ma
Collections: one only
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Middle Eocene | USA (Wyoming) | Orohippus agilis (type locality: 81455) |