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Mammalia - Perissodactyla
It was reranked as the infraorder Hippomorpha by Prothero and Schoch (1989); it was reranked as the unranked clade Hippomorpha by Hooker and Dashzeveg (2004).
It was assigned to Perissodactyla by Ferrusquia-Villafranca (1969), McKenna (1975), Thurmond and Jones (1981) and Carroll (1988); to Mesaxonia by Prothero and Schoch (1989); and to Euperissodactyla by 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.