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Sifrhippus
Taxonomy
Sifrhippus was named by Froehlich (2002) [Froehlich's name misspelt as Froelich by Secord et al. 2012].
It was assigned to Equoidea by Hooker and Dashzeveg (2004); and to Equidae by Froehlich (2002) and Secord et al. (2012).
It was assigned to Equoidea by Hooker and Dashzeveg (2004); and to Equidae by Froehlich (2002) and Secord et al. (2012).
Synonyms
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Synonymy list
| Year | Name and author |
|---|---|
| 2002 | Sifrhippus Froehlich p. 153 fig. 1 |
| 2002 | Arenahippus Froehlich p. 159 fig. 1 |
| 2002 | Sifrhippus Froehlich p. 159 |
| 2002 | Arenahippus Froehlich p. 165 |
| 2004 | Sifrhippus Hooker and Dashzeveg p. 1374 |
| 2012 | Sifrhippus Secord et al. p. 959 |
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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.
G. †Sifrhippus Froehlich 2002
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†Sifrhippus grangeri Gingerich 1989
†Sifrhippus sandrae Gingerich 1989
Invalid names: Arenahippus Froehlich 2002 [synonym]
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| D. J. Froehlich 2002 (Arenahippus) | The clade composed of Arenahippus 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). Some members of the group have a single medial cusp on the P2 (Character 21, 0 to 1), a moderate M3 hypolophids (Character 104, 0 to 1), a somewhat anterior P3 paraconule (Character 24, 0 to 1), molar metaconid twinned and equal in size (Character 83, 1 to 2), and lower molar metaconid separation large (Character 84, 0 to 1). The group lacks the synapomorphy of the next more-derived equid clade composed of Xenicohippus and more-derived equids, a crenulated M3 heel (Character 103, 0 to 1). |
Measurements
No measurements are available
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| Source: f = family, subc = subclass, c = class, subp = subphylum | |||||
| References: Lillegraven 1979, Hendy et al. 2009, Ji et al. 2002, Nowak 1991, Carroll 1988 | |||||
Age range: base of the Graybullian to the top of the Wasatchian or 55.80000 to 50.30000 Ma
Collections (414 total)