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Miohippus grandis

Mammalia - Perissodactyla - Equidae

Taxonomy
Mesohippus grandis was named by Clark and Beerbower (1967). Its type locality is Peanut Peak, which is in a Chadronian terrestrial horizon in the Chadron Formation of South Dakota.

It was synonymized subjectively with Miohippus assiniboiensis by Prothero and Shubin (1989); it was recombined as Miohippus grandis by Storer and Bryant (1993).

Synonymy list
YearName and author
1967Mesohippus grandis Clark and Beerbower
1993Miohippus grandis Storer and Bryant p. 663 fig. 3.3
1998Mesohippus grandis MacFadden p. 543

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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
RankNameAuthor
—Mammaliaformes
classMammalia
—Cladotheria
—Zatheria
subclassTribosphenida()
subclassTheria
—Eutheria()
—Placentalia
—Boreoeutheria
—Laurasiatheria
—Scrotifera
—Euungulata
—Panperissodactyla
superorderPerissodactylamorpha
orderPerissodactyla()
superfamilyEquoidea
familyEquidae
subfamilyAnchitheriinae()
genusMiohippus
speciesgrandis()

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.

†Miohippus grandis Clark and Beerbower 1967
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Diagnosis
ReferenceDiagnosis
J. E. Storer and H. N. Bryant 1993"1-3 length = 38-42 mm. Skull longer than Miohippus obliquidens, but shorter than Miohippus intermedius. Hypostyles all class 3. Crochets frequently present."
Measurements
No measurements are available
Composition: phosphaticsubp
Environment: terrestrialsubc
Locomotion: actively mobilec
Life habit: ground dwellingf
Diet: browserf
Reproduction: viviparoussubc
Created: 2005-06-08 10:11:09
Modified: 2005-08-31 16:55:50
Source: f = family, subc = subclass, c = class, subp = subphylum
References: Carroll 1988, Ji et al. 2002, Hendy et al. 2009, Nowak 1991, Lillegraven 1979

Age range: base of the Chadronian to the top of the Orellan or 37.20000 to 33.30000 Ma

Collections (6 total)


Time interval Ma Country or state Original ID and collection number
Chadronian37.2 - 33.9USA (Montana) Miohippus grandis (16959 16988 17010)
Chadronian37.2 - 33.9Canada (Saskatchewan) Miohippus grandis (16919)
Chadronian37.2 - 33.9USA (South Dakota) Mesohippus grandis (type locality: 17006)
Orellan33.9 - 33.3Canada (Saskatchewan) Miohippus grandis (17111)