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Sifrhippus grangeri
Taxonomy
Hyracotherium grangeri was named by Gingerich (1989) [raised to species level]. Its type specimen is AMNH 16134, a maxilla (left maxilla fragment with P3–M3), and it is a 3D body fossil.
It was recombined as Arenahippus grangeri by Froehlich (2002); it was recombined as Sifrhippus grangeri by Secord et al. (2012).
It was recombined as Arenahippus grangeri by Froehlich (2002); it was recombined as Sifrhippus grangeri by Secord et al. (2012).
Synonymy list
| Year | Name and author |
|---|---|
| 1989 | Hyracotherium grangeri Gingerich |
| 1998 | Hyracotherium grangeri MacFadden p. 542 |
| 2002 | Arenahippus grangeri Froehlich pp. 165-169 |
| 2011 | Hyracotherium grangeri Wood et al. p. 2 |
| 2012 | Sifrhippus grangeri Secord et al. p. 962 |
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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.
†Sifrhippus grangeri Gingerich 1989
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| D. J. Froehlich 2002 | This taxon lacks any unambiguous autapomorphies but the clade composed of Arenahippus grangeri and all more-derived equids is uniquely diagnosed by the presence of P4 posterior ridge moderate (Character 76, 0 to 1), premolar paralophid complex very short (Character 79, 1 to 0), and molar paracristid bend rounded (Character 88, 1 to 0), but lacks a single medial cusp on the P2 (Character 21, 0 to 1), and a moderate M3 hypolophid (Character 104, 0 to 1), the synapomorphies of the next more-derived equid clade. |
Measurements
No measurements are available
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| Source: f = family, subc = subclass, c = class, subp = subphylum | |||||
| References: Nowak 1991, Hendy et al. 2009, Carroll 1988, Lillegraven 1979, Ji et al. 2002 | |||||
Age range: Wasatchian or 55.80000 to 50.30000 Ma
Collections (185 total)