|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 circulus by Forsten (1975); it was recombined as Calippus (Grammohippus) circulus by Hulbert (1988); it was recombined as Calippus circulus by MacFadden (1998) and Kelly (1998).
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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||Size smaller than Pliohip- pus supremus; teeth shorter crowned· metaconid and metastylid closely a;- pressed and symmetrically rounded; meta- conid larger than metastylid; flexids short; parastylid sloping across anterior face of teeth and for most part reduced to a scar; protoconid and hypoconid deep and strongly rounded on premolars, less so on molars; hypoconulid prominent on premolars and with a hypostylid fold; hypoconulid narrow, not pronounced, and without a hypostylid fold on the molars.|
|R. C. Hulbert 1988||Cheekteeth with least unworn crown height of known species of the subgenus; unworn molar MSCH about 40 mm. Smaller than C. mmtini, with less complex fossettes, poorly developed pli caballins on premolars, and variable, often strong protostylids.|