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Sifrhippus sandrae
Taxonomy
Hyracotherium sandrae was named by Gingerich (1989).
It was recombined as Sifrhippus sandrae by Froehlich (2002) and Secord et al. (2012).
It was recombined as Sifrhippus sandrae by Froehlich (2002) and Secord et al. (2012).
Synonymy list
| Year | Name and author |
|---|---|
| 1989 | Hyracotherium sandrae Gingerich |
| 1998 | Hyracotherium sandrae MacFadden p. 542 |
| 2002 | Sifrhippus sandrae Froehlich p. 159 |
| 2012 | Hyracotherium sandrae Rose et al. |
| 2012 | Sifrhippus sandrae 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 sandrae Gingerich 1989
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| D. J. Froehlich 2002 | Small early Eocene equid with a distinct bowl on the anterior part of the pre-ultimate lower molars formed by a strong paralophid connected to a strong premetacristid. The bowl-shaped paralophid is a unique apomorphy of this taxon. Three other characters were identified in this analysis as autapomorphies of this OTU: upper molar metaconule weak and stepped on metaloph (Character 49, 0 to 1), and long paralophid complex (Character 86, 0 to 1). This taxon is identified in the analysis as the basal equid and thus it shares all of these synapomorphies: P3 talonid forming a weak bowl (Character 73, 2 to 1), P4 entoconid small (Character 75, 2 to 1), lower molar hypolophid deeply notched (Character 91, 1 to 0), and predominately type I (Character 93, 3 to 1), ilium extended and wedge shaped, with concave crista ilica and complex tuber coxae (Character 111, 0 to 1), trochanter major of femur high (Character 116, 0 to 1), and astragalar trochlea slightly inclined (Character 121, 0 to 1). The taxon lacks the synapomorphies of the next more inclusive equid clade: lower molar postcristid buccal (Character 97, 1 to 0) and pre-M3 hypoconulid strong (Character 98, 1 to 0). |
Measurements
No measurements are available
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| Source: f = family, subc = subclass, c = class, subp = subphylum | |||||
| References: Carroll 1988, Nowak 1991, Lillegraven 1979, Hendy et al. 2009, Ji et al. 2002 | |||||
Age range: Wasatchian or 55.80000 to 50.30000 Ma
Collections (24 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Ypresian | Belgium (Hainaut) | Sifrhippus sandrae (87947) | |
| Wasatchian | USA (Wyoming) | Hyracotherium sandrae (15759 15760 15761 15771 15780) | |
| Early/Lower Eocene | USA (Wyoming) | Hyracotherium sandrae (15591 154251 154253 154254 154255 154257 154258 154259 154263 154268 154269 154270 154271 154272 154274 154280 154281 154282) |