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Miohippus equinanus
Taxonomy
Miohippus equinanus was named by Osborn (1918) [name used by Macdonald 1970, who does not cite or discuss Skinner et al.]. Its type specimen is AMNH 12912, a partial skull (Upper jaws containing pLm3 of left side, p1- 3 of right side), and it is a 3D body fossil. Its type locality is AMNH Rosebud 1, which is in an Arikareean terrestrial horizon in South Dakota.
It was recombined as Archaeohippus equinanus by Skinner et al. (1968).
It was recombined as Archaeohippus equinanus by Skinner et al. (1968).
Synonymy list
| Year | Name and author |
|---|---|
| 1918 | Miohippus equinanus Osborn p. 65 figs. Plate 3.6. Text Fig. 45 |
| 1940 | Miohippus equinanus Stirton p. 172 |
| 1968 | Archaeohippus equinanus Skinner et al. |
| 1998 | Miohippus equinanus MacFadden p. 544 |
| 2011 | Miohippus equinanus Strganac p. 20 |
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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 equinanus Osborn 1918
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| H. F. Osborn 1918 | (Matthew, 1913, Osborn, 1918) (1) The type is an animal of slightly smaller size than the type of
Mesohippus bairdii, more progressive in dentition and in foot construction. (2) Teeth slightly more hypsodont than in M. bairdii; (3) p2- 4 occupy more space (.036) than mH (.031); (4) m3 considerably reduced; (5) parastyle of p2 prominent, elongating; (6) metaloph nearly uniting with ectolophs of molars, also uniting in an early stage in the premolars; (7) hypostyle relatively large on premolars and molars; (8) lower teeth in referred specimens with metaconid and metastylid cusps relatively large and distinct; (9) metalophid united with metastylid in an early stage of wear. |
Measurements
No measurements are available
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| Source: f = family, subc = subclass, c = class, subp = subphylum | |||||
| References: Hendy et al. 2009, Carroll 1988, Ji et al. 2002, Nowak 1991, Lillegraven 1979 | |||||
Age range: base of the Arikareean to the top of the Harrisonian or 29.50000 to 18.50000 Ma
Collections (10 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Geringian | USA (South Dakota) | Miohippus equinanus (17626 17630 17636) | |
| Arikareean | USA (South Dakota) | Miohippus equinanus (type locality: 17447 17460 17461) | |
| Monroecreekian | USA (South Dakota) | Archaeohippus equinanus (17723) Miohippus equinanus (17564) | |
| Monroecreekian | USA (Washington) | Miohippus equinanus (119838) | |
| Harrisonian | USA (South Dakota) | Miohippus equinanus (17451) |