|Basic info||Taxonomic history||Classification||Relationships|
|Morphology||Ecology and taphonomy||External Literature Search||Age range and collections|
Pliohippus (Pliohippus) mexicanus
Mammalia - Perissodactyla - Equidae
It was recombined as Pliohippus mexicanus by Lance (1950) and Azzaroli (1966); it was recombined as Asinus mexicanus by Quinn (1955); it was recombined as Dinohippus mexicanus by May and Repenning (1982), MacFadden (1984), MacFadden (1986), MacFadden (1998) and Kelly (1998).
|Year||Name and author|
|1950||Pliohippus mexicanus Lance|
|1950||Pliohippus (Pliohippus) mexicanus Lance p. 35 figs. 4 - 10|
|1955||Asinus mexicanus Quinn p. 52|
|1958||Hippotigris ocotensis Mooser p. 360|
|1964||Protohippus muelleri Mooser p. 157 figs. 1, 2|
|1966||Pliohippus mexicanus Azzaroli|
|1973||Dinohippus muelleri Mooser|
|1973||Equus (Dolichohippus) mesamexicanus Mooser p. 261 figs. 7 - 12|
|1980||Dinohippus ocotensis Dalquest and Mooser p. 8|
|1982||Dinohippus mexicanus May and Repenning|
|1984||Dinohippus mexicanus MacFadden p. 280|
|1986||Dinohippus mexicanus MacFadden p. 468|
|1998||Dinohippus mexicanus Kelly|
|1998||Dinohippus mexicanus MacFadden p. 551|
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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.
|B. J. MacFadden 1984||The following is translated and para- phrased from Lance (1950:35-36): Size similar to Pliohippus osborni and "Pliohippus" interpolatus. The upper cheek teeth have slightly to moderately curved crowns, similar to Pliohippus osborni and less than Pliohippus interpolatus. The protocone is usually large and elongated, with a well developed anterior projec- tion; the lingual flexid varies from weak to pronounced, similar to species of Plesippus. The styles are moder- ately or strongly developed. The fossettes are crescent- shaped ("half-moon"), more so than in Pliohippus osborni. The fossette plications are moderately devel- oped in early wear stages. The postprotoconal valley is deep; the pli caballin can either be present or absent. The lower cheek teeth have rounded metaconids and rounded or angular metastylids. The metaconids and metastylids remain well separated until late wear stages; the linguaflexid is V-shaped. The protoconids and hy- poconids are flattened [relative to e.g., primitive plio- hippines]. A pli caballinid is sometimes present during early wear stages. The stylids [particularly the proto- stylid] vary from present to absent.
In addition, based on the present reappraisal of this species, D. mexicanus is characterized by a moderately developed nasomaxillary ("lacrimal" ofsome workers) fossa and no malar fossa.