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Cormohipparion goorisi
Taxonomy
Cormohipparion goorisi was named by MacFadden and Skinner (1981) [type locality is 18665]. Its type specimen is F:AM 73940, a skull (well-preserved skull with alveoli for incisors, right canine and pl, and right and left P2-M3), and it is a 3D body fossil.
It was recombined as Merychippus goorisi by Kelly (1995), MacFadden (1998), Kelly (1998).
It was recombined as Merychippus goorisi by Kelly (1995), MacFadden (1998), Kelly (1998).
Synonymy list
| Year | Name and author |
|---|---|
| 1981 | Cormohipparion goorisi MacFadden and Skinner p. 620 figs. 1 - 3 |
| 1984 | Cormohipparion goorisi MacFadden p. 150 figs. 22, 23, 118-123, 149, 150 |
| 1995 | Merychippus goorisi Kelly p. 25 |
| 1996 | Cormohipparion goorisi Woodburne p. 16 |
| 1998 | Merychippus goorisi Kelly |
| 1998 | Merychippus goorisi MacFadden p. 547 |
| 2007 | Cormohipparion goorisi Woodburne |
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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.
†Cormohipparion goorisi MacFadden and Skinner 1981
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| B. J. MacFadden and M. F. Skinner 1981 | Small hipparion. Cheek teeth mesodont (i.e., intermediate between brachyodont and hypsodont). Protocone rounded with anterior spur. Cheek teeth covered with cement. Skull small relative to hipparions such as species of North American Hipparion s. s., Neohipparion, and the other species of Cormohipparion. Nasal notch shallow and it ex- tends posteriorly to a position that lies dorsal to the canine. Prominent nasomaxillary fossa lying over P3_M1 with well-developed and continuous anterior and posterior rims. Very deep posterior pocket of fossa that extends almost to the anterior margin of the orbit. Fossa positioned far forward of orbit resulting in a wide preorbital bar. The anterior margin of the lacrimal bone usually does not touch the posterior rim of the fossa. In the upper cheek teeth, protocones rounded with anterior spur (particularly during early wear stages), fossette borders moderately plicated, plicaballin consists of single or double loops and deep hypo- conal groove. In the lower cheek teeth, ectoparastylids absent or rudimentary, deep ectoflexids, plicaballinids rudimentary or absent, metaconids and metastylids small, rounded, and moderately separated, and moderately developed enamel plications. |
Measurements
No measurements are available
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| Source: g = genus, subf = subfamily, subc = subclass, c = class, subp = subphylum | |||||
| References: MacFadden 1998, Ji et al. 2002, Lillegraven 1979, Hendy et al. 2009, MacFadden and Cerling 1996, Carroll 1988 | |||||
Age range: Barstovian or 16.30000 to 12.50000 Ma
Collections (7 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Miocene | USA (Florida) | Cormohipparion goorisi (18594) | |
| Barstovian | USA (Texas) | Cormohipparion goorisi (18608) | |
| Barstovian | USA (Nebraska) | Cormohipparion goorisi (18442) | |
| Barstovian | USA (Louisiana) | Merychippus goorisi (18621 18652 164388) | |
| Early/Lower Barstovian | USA (Texas) | Cormohipparion goorisi (18665) |