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Parahippus pawniensis
Taxonomy
Parahippus pawniensis was named by Gidley (1907) [Gidley (1907) lists type locality as Pawnee Buttes Creek]. Its type specimen is AMNH 9805, a partial skeleton (The upper and lower cheek teeth of one side, and fragments of the skeleton, including parts of the feet. ), and it is a 3D body fossil. Its type locality is Martin Canyon Quarry A, which is in a Hemingfordian channel horizon in the Pawnee Creek Formation of Colorado.
Subspecies
Synonymy list
| Year | Name and author |
|---|---|
| 1907 | Parahippus pawniensis Gidley |
| 1918 | Parahippus pawniensis Osborn p. 92 figs. Plates 8.5, 9.3. Text Figs. 68, 69 |
| 1937 | Parahippus pawniensis Schlaikjer p. 272 |
| 1940 | Parahippus pawniensis Stirton p. 177 |
| 1998 | Parahippus pawniensis MacFadden p. 546 |
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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.
†Parahippus pawniensis Gidley 1907
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†Parahippus pawniensis atavus Osborn 1918
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| H. F. Osborn 1918 | (Gidley, 1907, p. 932) "(1) Cheek teeth shorter crowned than in any other species hitherto described;
(2) the metaloph in the upper teeth is comparatively straight, with enamel walls simple except for the median anterior fold, or crochet; (3) crochet slightly united with the protoconule at its base; (4) external walls of paracone and metacone relativelyflat;asinP.crenidens,withonlyafaintindicationofthemedianrib; (5)crownsofuppercheekteethproportion- ately narrower than in P. crenidens; (6) the metastylid in the lower less prominent and less distinctly separated from the metaconid than in the other known species of this genus. This type apparently represents one of the least specialized species of the genus." (Osborn,.1918) (7) Crochet present on superior grinders and prominent, especially on m1-3, conse- quently pre- and postfossettes early enclosed. |
Measurements
No measurements are available
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| Source: f = family, subc = subclass, c = class, subp = subphylum | |||||
| References: Lillegraven 1979, Ji et al. 2002, Nowak 1991, Hendy et al. 2009, Carroll 1988 | |||||
Age range: base of the Hemingfordian to the top of the Harrisonian or 20.43000 to 18.50000 Ma
Collections (13 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Arikareean | USA (Oregon) | Parahippus pawniensis (188964) | |
| Harrisonian | USA (South Dakota) | Parahippus coloradensis (17747 17749) | |
| Harrisonian | USA (Oregon) | Parahippus pawniensis (19037) | |
| Early/Lower Hemingfordian | USA (Oregon) | Parahippus pawniensis (17966 167866 170310) | |
| Early/Lower Hemingfordian | USA (California) | Equidae indet. (17762) Parahippus pawniensis (167841) | |
| Hemingfordian | USA (Wyoming) | Parahippus pawniensis (17953) | |
| Hemingfordian | USA (Nevada) | Parahippus pawniensis (18961 18962) | |
| Hemingfordian | USA (Colorado) | Parahippus pawniensis (type locality: 17965) |