|Basic info||Taxonomic history||Classification||Relationships|
|Morphology||Ecology and taphonomy||External Literature Search||Age range and collections|
Mammalia - Perissodactyla - Equidae
It was synonymized subjectively with Hippidium by Cope (1879); it was synonymized subjectively with Protohippus by Gidley (1903) and Gidley (1904).
It was assigned to Protohippinae by Gidley (1907); to Protohippini by Quinn (1955); to Equidae by Marsh (1874), Matthew and Stirton (1930), Stirton (1940), Webb (1969), Carroll (1988) and Hulbert (1989); to Pliohippina by Prado and Alberdi (1996); and to Equini by Prothero and Schoch (1989), Kelly (1995), MacFadden (1998) and Ferrusquía-Villafranca et al. (2014).
|Year||Name and author|
|1892||Pliohippus gracilis Marsh p. 347|
|1907||Pliohippus Gidley p. 867|
|1918||Kalobatippus gracilis Osborn p. 71 figs. Text Figs. 49, 51|
|1930||Pliohippus Matthew and Stirton|
|1940||Anchitherium gracilis Stirton p. 174|
|1955||Pliohippus Quinn p. 13|
|1989||Pliohippus Hulbert, Jr.|
|1989||Pliohippus Prothero and Schoch p. 532|
|1995||Pliohippus Kelly p. 14|
|1996||Pliohippus Prado and Alberdi p. 676|
|1998||Kalobatippus gracilis MacFadden|
|1998||Pliohippus MacFadden p. 550|
|2014||Pliohippus Ferrusquía-Villafranca et al. p. 204|
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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.
|J. H. Quinn 1955||sence of malar fossa; strongly curved upper cheek teeth; flat- tened entoconid with shallow valleys, prominent ribs and reduced styles with the parastyles of the premolars little or no larger than those of the molars; small, round to oval protocones; postprotoconal valleys shallow; hypoconal grooves partly closed; metaconids and metastylids round- ed, not widely separated, and nearly equal in size; no· pli caballinds; parastylids faint and oriented as in Hippodon; proto- conids and hypoconids transversely broad and markedly rounded; metapodials short, lateral digits present in earlier species but probably lost in later species.|