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Desmatippus tyleri
Taxonomy
Parahippus tyleri was named by Loomis (1908). Its type specimen is Amherst College 1079, a partial skull, and it is a 3D body fossil. Its type locality is Agate (8 Miles NE), which is in a Harrisonian terrestrial horizon in the Harrison Formation of Nebraska.
It was synonymized subjectively with Parahippus nebrascensis by Cook (1912); it was recombined as Desmatippus tyleri by MacFadden (1998).
It was synonymized subjectively with Parahippus nebrascensis by Cook (1912); it was recombined as Desmatippus tyleri by MacFadden (1998).
Sister species lacking formal opinion data
Synonymy list
| Year | Name and author |
|---|---|
| 1908 | Parahippus tyleri Loomis p. 163 fig. 1 |
| 1916 | Parahippus tyleri Sellards |
| 1918 | Parahippus tyleri Osborn p. 77 figs. Plate 9.6,8, 39.10,12. Text Figs. 53, 54, 56 |
| 1930 | Parahippus tyleri Hay |
| 1935 | Parahippus tyleri Schlaikjer p. 149 |
| 1937 | Parahippus tyleri Schlaikjer p. 271 |
| 1940 | Parahippus tyleri Stirton p. 177 |
| 1998 | Desmatippus tyleri 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.
†Desmatippus tyleri Loomis 1908
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| H. F. Osborn 1918 | (Loomis) (I) About one-fourth smaller than P. nebrascencis. (2) Facial portion of skull moderately high and narrow. (3) In upper incisors a deep pit entirely surrounded by raised internal cingulum; (4) canine alveolus small [possibly a female]; (5) parastyle and mesostyle less prominent than in P. nebrascencis; (6) vestigial cingulum on protoloph; (7) protocone and protoconules separated by a narrow constriction; (8) metalophs of pLm3 exhibit small crochet; (9) metalophs not uniting, thus pli crochet not entirely isolated; (10) hypostyle strong, notched posteriorly; (11) pit in lower incisors resembling a groove; (12) p1 diminutive, prm3 with well marked external cingulum terminat- ing in a diminutive hypoconulid; (13) heel of rna mode:rate in size; (14) no indication of cement. |
Measurements
No measurements are available
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| Source: f = family, subc = subclass, c = class, subp = subphylum | |||||
| References: Carroll 1988, Ji et al. 2002, Nowak 1991, Lillegraven 1979, Hendy et al. 2009 | |||||
Age range: base of the Harrisonian to the top of the Hemingfordian or 23.10000 to 16.30000 Ma
Collections (4 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Harrisonian | USA (Nebraska) | Parahippus tyleri (type locality: 17740) | |
| Early/Lower Hemingfordian | USA (Wyoming) | Parahippus tyleri (18882) | |
| Early/Lower Hemingfordian | USA (Nebraska) | Parahippus tyleri (17898) | |
| Hemingfordian | USA (New Mexico) | Parahippus tyleri (19434) |