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Merychippus missouriensis

Mammalia - Perissodactyla - Equidae

Taxonomy
Merychippus missouriensis was named by Douglass (1908). Its type specimen is CM 905, a partial skeleton (a portion of a skull, a mandible, a radius, two femora, two complete and two incomplete metapodials, also numerous fragments), and it is a 3D body fossil.

It was recombined as Merychippus (Merychippus) missouriensis by Stirton (1940); it was recombined as Stylonus missouriensis by Kelly and Lander (1988).

Synonymy list
YearName and author
1908Merychippus missouriensis Douglass p. 274 figs. Pl. LXVI; LXVII, Fig. 5; Pl. LXVIII, Figs. 1 and 2
1918Merychippus missouriensis Osborn p. 119 fig. 93
1940Merychippus (Merychippus) missouriensis Stirton p. 181
1988Stylonus missouriensis Kelly and Lander
2001Merychippus missouriensis Tabrum and Nichols p. 92

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RankNameAuthor
kingdomAnimalia()
Triploblastica
Nephrozoa
Deuterostomia
phylumChordataHaeckel 1847
subphylumVertebrata
superclassGnathostomata
Osteichthyes()
Sarcopterygii
subclassDipnotetrapodomorpha(Nelson 2006)
subclassTetrapodomorpha()
Tetrapoda()
Reptiliomorpha
Anthracosauria
Batrachosauria()
Cotylosauria()
Amniota
Synapsida()
Therapsida()
RankNameAuthor
infraorderCynodontia()
Epicynodontia
infraorderEucynodontia
Probainognathia
Mammaliamorpha
Mammaliaformes
classMammalia
subclassTribosphenida()
infraclassEutheria()
Placentalia
orderPerissodactyla()
suborderLophodontomorpha
infraorderEuperissodactyla
Hippomorpha
superfamilyEquoidea
familyEquidae
subfamilyEquinaeSteinmann and Döderlein 1890
genusMerychippus
speciesmissouriensis

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.

Diagnosis
ReferenceDiagnosis
H. F. Osborn 1918(Douglass, p. 274) (1) Lachrymal fossa long and moderately deep; (2) malar pit with steep posterior side, bounded below by a thin, shelf-like malar-maxillary ridge. (3) Temporary molars brachyodont or brachy-hypsodont; (4) permanent molars curved and strongly hypsodont; (5) both series of teeth with a coating of cement which is not very thick; (6) enamel lakes simple with only one or two simple enamel folds on each; (7) protocone and hypocone laterally
compressed, the former separate from the protoconule but having an angular projection toward the latter; (8) first tempo- rary lower molar minute; (9) intermediate external conule on lower temporary molars concave on the inside, more or less flattened on the outside. (10) Metapodial nearly ninety per cent. of the length of the radius and eighty-four per cent. of the length of the femur exclusive of the proximal epiphysis.
(Matthew, 1913) The deciduous premolars are moderately high-crowned. This general type is difficult to distinguish from M. isonesus Cope, with which it agrees in size.