|Basic info||Taxonomic history||Classification||Relationships|
|Morphology||Ecology and taphonomy||External Literature Search||Age range and collections|
Mammalia - Perissodactyla - Equidae
It was recombined as Pliohippus (Astrohippus) osborni by Stirton (1940); it was recombined as Hippotigris osborni by Quinn (1955); it was synonymized subjectively with Dinohippus leidyanus by Azzaroli (1988) and Kelly (1998); it was recombined as Dinohippus osborni by May and Repenning (1982), Kelly and Lander (1988) and MacFadden (1998).
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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.