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Arenahippus pernix
Taxonomy
Eohippus pernix was named by Marsh (1876). Its type specimen is YPM 11304 (lectotype), a set of limb elements (left astragalus and associated distal tibia), and it is a 3D body fossil. Its type locality is Bitter Creek, which is in a Wasatchian terrestrial horizon in the Wasatch Formation of Wyoming.
It was synonymized subjectively with Hyracotherium index by Wortman (1896), Trouessart (1898) and Matthew (1899); it was synonymized subjectively with Hyracotherium vasacciense by Kitts (1956); it was recombined as Hyracotherium pernix by Gingerich (1991) and MacFadden (1998); it was considered a nomen dubium by Granger (1908); it was recombined as Arenahippus pernix by Froehlich (2002).
It was synonymized subjectively with Hyracotherium index by Wortman (1896), Trouessart (1898) and Matthew (1899); it was synonymized subjectively with Hyracotherium vasacciense by Kitts (1956); it was recombined as Hyracotherium pernix by Gingerich (1991) and MacFadden (1998); it was considered a nomen dubium by Granger (1908); it was recombined as Arenahippus pernix by Froehlich (2002).
Synonymy list
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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.
†Arenahippus pernix Marsh 1876
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| D. J. Froehlich 2002 | This taxon lacks any unambiguous autapomorphies but the clade composed of Arenahippus pernix and all more-derived equids is uniquely diagnosed by the presence of P3 paraconule somewhat anterior (Character 24, 0 to 1), lower molar metaconid twinned and equal in size (Character 83, 1 to 2), and lower molar metaconid separation large (Character 84, 0 to 1) but lacks the crenulated M3 heel (Character 103, 0 to 1), the synapomorphy of the next more-derived equid clade. |