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Scaphohippus intermontanus

Mammalia - Perissodactyla - Equidae

Taxonomy
Merychippus intermontanus was named by Merriam (1915). Its type specimen is UCMP 21400, a set of teeth (Complete superior molar series of right side, P2-M3), and it is a 3D body fossil. Its type locality is Barstow (UCMP 1401), which is in a Barstovian terrestrial horizon in the Barstow Formation of California.

It was recombined as Protohippus intermontanus by Maxson (1930) and Stirton (1933); it was recombined as Merychippus (Protohippus) intermontanus by Stirton (1940) and Dorr (1956); it was recombined as Pliohippus intermontanus by Quinn (1955); it was recombined as Scaphohippus intermontanus by Pagnac (2006).

Synonymy list
YearName and author
1915Merychippus intermontanus Merriam
1918Merychippus intermontanus Osborn p. 121 figs. Text Fig. 95
1930Protohippus intermontanus Maxson
1933Protohippus intermontanus Stirton
1940Merychippus (Protohippus) intermontanus Stirton p. 182
1955Pliohippus intermontanus Quinn p. 22
1956Merychippus (Protohippus) intermontanus Dorr, Jr. p. 70
1972Merychippus intermontanus Woodburne and Golz
1987Merychippus intermontanus Quinn
1995Merychippus intermontanus Kelly p. 25
1998Merychippus intermontanus MacFadden p. 547
2006Scaphohippus intermontanus Pagnac p. 48

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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
genusScaphohippus
speciesintermontanus()

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.

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Diagnosis
ReferenceDiagnosis
H. F. Osborn 1918(Merriam, p. 50) "Cheek-teeth large; crowns long, strongly curved, heavily cemented. Protocone of upper cheek-teeth uniting early with protoconule. Enamel walls bordering the fossettes comparatively simple."