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Hipparion shirleyae
Taxonomy
Hipparion shirleyi was named by MacFadden (1984) [type locality is Wright Farm [18675]]. Its type specimen is F:AM 73950, a skeleton (skull, mandible, and nearly complete associated postcranial skeleton), and it is a 3D body fossil. Its type locality is Wright Farm, which is in a Barstovian terrestrial horizon in the Fleming Formation of Texas.
It was corrected as Hipparion shirleyae by Hulbert and MacFadden (1991), Kelly (1995) and MacFadden (1998).
It was corrected as Hipparion shirleyae by Hulbert and MacFadden (1991), Kelly (1995) and MacFadden (1998).
Sister species lacking formal opinion data
Synonymy list
| Year | Name and author |
|---|---|
| 1984 | Hipparion shirleyi MacFadden p. 58 figs. 25-31,146,150 |
| 1991 | Hipparion shirleyae Hulbert, Jr. and MacFadden pp. 39 - 40 |
| 1995 | Hipparion shirleyae Kelly |
| 1998 | Hipparion shirleyae MacFadden p. 548 |
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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.
†Hipparion shirleyae MacFadden 1984
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| B. J. MacFadden 1984 | Small hipparion; size similar to, or slightly smaller than, Cormohipparion goorisi from the same region and smaller than Hipparion tehonense from the Texas Panhandle. Cheek tooth row and occlusal cross-sectional area significantly smaller than Hipparion tehonense. Mean TRL 105.35 mm. DPOF characteristic of Hipparion sensu stricto: Posteriorly, fossa is moderately deep dorsoventrally with well-defined posterior rim. Wide PRB, i.e., posterior margin of the fossa is far anterior to the orbital margin in contrast to Neohipparion and Cormohipparion. Lacrimal bone does not touch posterior margin ofthe fossa. In contrast to Cormohipparion, anterior margin of DPOF poorly defined and blends into anterior region of the face; posterior pocket very poorly developed or absent. No malar fossa. Relatively deep nasal notch.
Teeth mesodont, i.e., intermediate between brachydont and hypsodont. Unworn or little-worn MlMSTHT ca.25-30mm. Protocone small, rounded, with a prominent anterior spur. Fossette borders moderately plicated. Deep hypoconal groove with constricted connection between hypocone and metaloph. Mandible shallow. Ectoflexids deep. Protostylids vary in development from prominent to absent. Tridactyl manus and pes. Hipparion shirleyi differs from merychippines and other hipparion genera in the distinctive development of the DPOF. Hipparion shirleyi is smaller, shorter crowned, has a relatively smaller protocone, and a more persistent anterior protoconal spur than either H. tehonense or H.forcei. Hipparion shirleyi also seems to have a slight posterior pocket of the DPOF that is not seen in either H. tehonense or H. forcei. |
Measurements
No measurements are available
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| Source: g = genus, subf = subfamily, subc = subclass, c = class, subp = subphylum | |||||
| References: Hendy et al. 2009, Carroll 1988, MacFadden 1998, Nowak 1991, Ji et al. 2002, Lillegraven 1979, MacFadden and Cerling 1996 | |||||
Age range: Barstovian or 16.30000 to 12.50000 Ma
Collections: one only
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Barstovian | USA (Texas) | Hipparion shirleyi (18675) |