|Basic info||Taxonomic history||Classification||Relationships|
|Morphology||Ecology and taphonomy||External Literature Search||Age range and collections|
Mammalia - Perissodactyla - Equidae
It was recombined as Merychippus (Merychippus) californicus by Stirton (1940); it was recombined as Stylonus californicus by Kelly and Lander (1988); it was considered a nomen dubium by Macdonald (1992).
|Year||Name and author|
|1915||Merychippus californicus Merriam|
|1918||Merychippus californicus Osborn p. 121 figs. Text Fig. 96|
|1940||Merychippus (Merychippus) californicus Stirton p. 181|
|1956||Merychippus californicus Downs p. 283|
|1988||Stylonus californicus Kelly and Lander|
|1995||Merychippus californicus Kelly|
|1998||Merychippus californicus MacFadden p. 547|
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|H. F. Osborn 1918||(Merriam, 1915) (1) Molars of more slender form than in M. isonesus, otherwise in some respects
similar; (2) protocone separate from protoconule almost to base of crown, connected only in very old, much worn teeth; (3) protocone round [oval] with a slightlateral compression [suboval]; (4) a spur extending toward protoconule; (5) enamel folding moderately complex, approximating that of M. isonesus; (6) superior molars somewhatnarrow in cross section and somewhat more hypsodont than in M. isonesus; (7) type of upper molar leading toward Hipparion; (8) lower cheek teeth closely resembling those of M . isonesus in form and dimensions.