|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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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.
|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.