|Basic info||Taxonomic history||Classification||Relationships|
|Morphology||Ecology and taphonomy||External Literature Search||Age range and collections|
Mammalia - Perissodactyla - Equidae
It was reranked as Protohippus (Merychippus) by Scott (1895).
It was assigned to Protohippus by Scott (1895); to Protohippinae by Gidley (1907); to Equidae by Leidy (1856), Stirton (1940) and Carroll (1988); to Hipparionini by Quinn (1955) and Kelly (1995); and to Equinae by Hay (1902), Prothero and Schoch (1989), MacFadden (1998) and Bravo-Cuevas and Ferrusquía-Villafranca (2006).
|Year||Name and author|
|1895||Protohippus (Merychippus) Scott p. 59|
|1902||Merychippus Hay p. 616|
|1907||Merychippus Gidley p. 867|
|1940||Merychippus quartus Stirton|
|1940||Merychippus Stirton p. 178|
|1940||Merychippus (Protohippus) quartus Stirton p. 182|
|1955||Merychippus Quinn p. 58|
|1989||Merychippus Prothero and Schoch p. 531|
|1995||Merychippus Kelly p. 26|
|1998||Merychippus MacFadden p. 547|
|2006||Merychippus Bravo-Cuevas and Ferrusquía-Villafranca p. 776|
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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.