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Merychippus republicanus

Mammalia - Perissodactyla - Equidae

Taxonomy
Merychippus republicanus was named by Osborn (1918). Its type specimen is AMNH 8347, a partial skeleton (A complete skull, finely preserved, teeth one-fourth worn, with associated vertebrae and parts of fore limb), and it is a 3D body fossil.

It was recombined as Merychippus (Merychippus) republicanus by Stirton (1940); it was recombined as Neohipparion republicanus by Voorhies (1990).

Synonymy list
YearName and author
1918Merychippus republicanus Osborn p. 125 figs. Plates 10.1, 17.7. T ext Fig. 99
1940Merychippus (Merychippus) republicanus Stirton p. 181
1990Neohipparion republicanus Voorhies
1998Merychippus republicanus MacFadden p. 547

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RankNameAuthor
kingdomAnimalia()
—Bilateria
—EubilateriaAx 1987
—Deuterostomia
phylumChordataHaeckel 1874
subphylumVertebrata
superclassGnathostomata
—Osteichthyes()
subclassSarcopterygii()
subclassDipnotetrapodomorpha(Nelson 2006)
subclassTetrapodomorpha()
—Tetrapoda
—Reptiliomorpha
—Anthracosauria
subclassAmphibiosauriaKuhn 1967
—Cotylosauria()
—Amniota
subclassSynapsida
—Therapsida()
infraorderCynodontia()
—Mammaliamorpha
—Mammaliaformes
RankNameAuthor
classMammalia
—Theriamorpha(Rowe 1993)
—Theriiformes()
—Trechnotheria
—Cladotheria
—Zatheria
subclassTribosphenida()
subclassTheria
—Eutheria()
—Placentalia
—Boreoeutheria
—Laurasiatheria
—Scrotifera
—Euungulata
—Panperissodactyla
superorderPerissodactylamorpha
orderPerissodactyla()
superfamilyEquoidea
familyEquidae
subfamilyEquinae
genusMerychippus
speciesrepublicanus

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.

†Merychippus republicanus Osborn 1918
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Diagnosis
ReferenceDiagnosis
H. F. Osborn 1918 (Matthew, 1913) (1) Medium size, p1-m3 .0255; (2) protocone separate about half way down, oval on premolars, somewhat flattened on molars; (3) enamel of fossettes strongly folded to about half way down the crown, (4) double pli caballin fold, as in M. calamariua; (5) plication of enamel of metaloph and hypostyle region more elaborate and branching than in M. calamariua; (6) metastylid of P2 posterior in position; (7) metaconid pillar distinct but very small; (8)metastylidmoderatelyseparatedin{>2,inrnabyshallowgroove,anteroexternalcingulumfolddistinctinhalfworn teeth. (9) Lachrymal fossa rather small and shallow, not sharply marked; (10) no malar fossa; (11) preorbital region short; (12) postcanine diastema one-fifth length of cheek teeth. Foot characters based on doubtfully referred speci-
mens; (13) metacarpals short, moderately slender, lateral digit complete though considerably reduced; (14) trapezium nodule very small and solidly coossified with trapezoid.