|Basic info||Taxonomic history||Classification||Relationships|
|Morphology||Ecology and taphonomy||External Literature Search||Age range and collections|
Mammalia - Perissodactyla - Equidae
It was recombined as Hipparion calamarius by Roger (1896), Trouessart (1898), Matthew (1899) and Hay (1902); it was recombined as Neohipparion calamarius by Matthew (1904) and Trouessart (1905); it was recombined as Merychippus (Merychippus) calamarius by Stirton (1940); it was recombined as Stylonus calamarius by Kelly and Lander (1988); it was recombined as Merychippus calamarius by Gidley (1907), Osborn (1918), Merriam (1919), Hay (1930), Kelly (1995) and MacFadden (1998).
|Year||Name and author|
|1875||Hippotherium calamarium Cope p. 2–3|
|1889||Hippotherium calamarium Cope p. 451|
|1896||Hipparion calamarius Roger|
|1898||Hipparion calamarius Trouessart|
|1899||Hipparion calamarius Matthew|
|1902||Hipparion calamarius Hay|
|1904||Neohipparion calamarius Matthew|
|1905||Neohipparion calamarius Trouessart|
|1907||Merychippus calamarius Gidley|
|1918||Merychippus calamarius Osborn p. 123 figs. Plates 11.4, 17.8, 18.2,6. Text Fig. 98|
|1919||Merychippus calamarius Merriam|
|1930||Merychippus calamarius Hay|
|1940||Merychippus (Merychippus) calamarius Stirton p. 181|
|1988||Stylonus calamarius Kelly and Lander|
|1995||Merychippus calamarius Kelly|
|1998||Merychippus calamarius 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||(Cope, 1875) (1) "The typical specimen belongs to an adult animal, and was taken from the matrix
by myself, without admixture of others." (2) Protocone column large, its centre anterior to the middle transverse line of the crown, an angular projection toward the protoconule, actually connecting with the protoconule in m2; (3) dentinal band connecting the inner crescents [pl ml], giving off two or rarely one fold [double pli caballin] in the crochet region; (4) borders of fossettes much plicate, anterior border of protoconule giving off from four to six folds; (4) posterior border of postfossette exhibits one deep fold, which is generally bifurcated [hypostyle region]; (5) p1 small, two-rooted; (6) no basal cingulum on either jaw; (7) molar, ms, smaller than the three preceding it.
(Matthew, 1913) (8) Grinding teeth extremely long-crowned; (9) protocone separate to about one-third from base,
suboval on premolars, more flattened on molars; (10) plications of enamel lake borders disappearing in well (two-thirds or more) worn teeth; (11) pli caballin fold double, disappearing about one-fourth from base; (12) metastylid not separate on P2· (13) Lachrymal fossa apparently large; (14) malar fossa variable, not very deep.