|Basic info||Taxonomic history||Classification||Relationships|
|Morphology||Ecology and taphonomy||External Literature Search||Age range and collections|
Mammalia - Perissodactyla - Equidae
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).
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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.
|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.|