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Mammalia - Perissodactyla - Equidae
It was reranked as Hyracotherium (Pliolophus) by Wortman (1896); it was synonymized subjectively with Eohippus by Granger (1908); it was synonymized subjectively with Hyracotherium by Kitts (1956), Schiebout (1974) and Gingerich (1991).
It was assigned to Hyracotheriinae by Cope (1881); to Hyracotherium by Wortman (1896); to Equoidea by Prothero and Schoch (1989); and to Equidae by Froehlich (2002) and Hooker and Dashzeveg (2004).
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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.