|Basic info||Taxonomic history||Classification||Relationships|
|Morphology||Ecology and taphonomy||External Literature Search||Age range and collections|
Mammalia - Perissodactyla - Equidae
It was recombined as Pliolophus montanus by Hay (1902); it was recombined as Eohippus montanus by Granger (1908) and Stirton (1940); it was recombined as Protorohippus montanus by Froehlich (1999); it was recombined as Protorohippus montanum 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 has no unambiguous autapomorphies but can be diagnosed by the characters of the node containing it and all more-derived equids: upper molar metaconule weak and stepped (Character 49, 0 to 1), upper molar convergence <90° (Character 65, 1 to 2), lower molar paracristid angle a30° (Character 87, 1 to 2), lower molar paracristid angle sharp (Character 88, 0 to 1), lower molar protolophid backwall steep (Character 90, 1 to 0), and lower preultimate molar hypoconulid closely appressed against hypolophid (Character 95, 0 to 1), but lacks the fol- lowing characters: P4 paraconule significantly anterior of line between paracone and protocone (Character 32, 0 to 1), upper molar mesostyle small (Character 46, 0 to 1), upper molar ectoloph moderately lophoid (Character 52, 0 to 1), upper molar protoloph sub-lophoid (Character 53, 0 to 1), P3 hypoconid large (Character 72, 0 to 1), lower molar cristid obliqua slightly lingual (Character 80, 2 to 1), lower molar protolophid incipiently lophoid (Character 89, 1 to 2), lower molar hypolophid straight (Character 92, 1 to 0), M3 hypolophid strong (Character 104, 1 to 2), and astragalar trochlea inclined >10° (Character 121, 1 to 2).|