|Basic info||Taxonomic history||Classification||Relationships|
|Morphology||Ecology and taphonomy||External Literature Search||Age range and collections|
Mammalia - Perissodactyla - Equidae
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.
|J. H. Quinn 1955||Protocones long; hypo- conal groove more than half closed in early forms to closed or nearly so in late forms; parastylid parallel to external face of protoconid and prominent on early forms, reduced on late forms; pli caballinid absent.|