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Megahippus

Mammalia - Perissodactyla - Equidae

Synonymy list
YearName and author
1938Megahippus McGrew p. 315 fig. 5
1940Megahippus Stirton p. 175
1988Megahippus Carroll
1989Megahippus Prothero and Schoch p. 531
1998Megahippus MacFadden p. 545

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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
subfamilyAnchitheriinae()
genusMegahippus

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.

G. †Megahippus McGrew 1938
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†Megahippus matthewi Barbour 1914
†Megahippus mckennai Tedford and Alf 1962
Diagnosis
ReferenceDiagnosis
P. O. McGrew 1938Dental formula I3/3 C?/1 P?/3 M3/3; larger than any known Hypohippus; cheek teeth essentially like those of Hypohippus, but much larger; incisors procumbent and very large; i1 with anteroposterior diameter one-third greater than transverse diameter; i1 one·third larger than i3; upper premolars with continuous inner cingulum.
Measurements
No measurements are available
Composition: phosphaticsubp
Environment: terrestrialsubc
Locomotion: actively mobilec
Life habit: ground dwellingf
Diet: browserg
Reproduction: viviparoussubc
Comments: browserbased on incisor arcade shape (MacFadden and Cerling 1996)g
Created: 2009-01-04 10:24:05
Modified: 2009-01-04 12:24:05
Source: g = genus, f = family, subc = subclass, c = class, subp = subphylum
References: Carroll 1988, MacFadden and Cerling 1996, Nowak 1991, Hendy et al. 2009, Lillegraven 1979, Ji et al. 2002

Age range: base of the Barstovian to the top of the Clarendonian or 16.30000 to 9.40000 Ma

Collections (34 total)


Time interval Ma Country or state Original ID and collection number
Miocene23.03 - 5.333USA (Montana) M. sp. (18812)
Barstovian16.3 - 12.5USA (Colorado) M. sp. (18203)
Barstovian16.3 - 12.5USA (Nebraska) M. mckennai (18031 18164 18209 18284 18287 18442) M. sp. (18027 18124 18199 18443)
Barstovian16.3 - 12.5USA (California) M. mckennai (19345 19364 19432 19458 19471 19548) M. sp. (214889)
Barstovian16.3 - 12.5USA (New Mexico) M. sp. (19535)
Barstovian16.3 - 12.5USA (Nevada) M. mckennai (19097)
Early/Lower Barstovian16.3 - 12.5USA (New Mexico) M. sp. (19547)
Clarendonian12.5 - 9.4USA (Nebraska) Hypohippus matthewi (18147) M. matthewi (18176 18233) M. sp. (18177)
Clarendonian12.5 - 9.4USA (California) M. matthewi (19383) M. sp. (19182 19507 19515)
Clarendonian12.5 - 9.4USA (Nevada) M. sp. (18845)
Late/Upper Clarendonian12.5 - 9.4USA (New Mexico) M. matthewi (19528)
Tortonian11.62 - 7.246USA (Florida) M. sp. (18509)
Late/Upper Miocene11.608 - 5.333USA (Colorado) M. sp. (18846)