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Orohippus progressus
Taxonomy
Orohippus progressus was named by Granger (1908). Its type specimen is AMNH 12120, a partial skull, and it is a 3D body fossil. Its type locality is Twin Buttes (Lower Bridger), which is in a Bridgerian terrestrial horizon in the Bridger Formation of Wyoming.
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.
†Orohippus progressus Granger 1908
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| D. B. Kitts 1957 | Sizesmall.MeanlengthofM3,9.25mm. (fourspecimens). Mean length of P4, 6.37 mm. (three specimens). Disastema between PI and P2. P4 narrower internally than externally, with hypocone nearly as far internal as protocone. Protoconid and metaconid usually closer together than hypoconid and entoconid on P4 and lower molars. P4, M1, and M2 usually narower anteriorly than posteriorly. |
Measurements
No measurements are available
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| Source: f = family, subc = subclass, c = class, subp = subphylum | |||||
| References: Ji et al. 2002, Carroll 1988, Nowak 1991, Lillegraven 1979, Hendy et al. 2009 | |||||
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 progressus (type locality: 16448) |