PBDB Taxon

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Miohippus

Osteichthyes - Perissodactyla - Equidae

Taxonomy

Miohippus was named by Marsh (1874). Its type is Miohippus annectens.

It was synonymized subjectively with Mesohippus by Matthew (1899).

It was assigned to Hyracotheriinae by Hay (1902); to Anchitheriinae by MacFadden (1998); and to Equidae by Marsh (1874), Scott (1913), Osborn (1918), Hay (1930), Stirton (1940), Carroll (1988), Prothero and Schoch (1989), Lofgren et al. (2020).

Species

Anchitherium longicristis, M. anceps, M. annectens (syn. M. crassicuspis) (type species), M. assiniboiensis (syn. Mesohippus planidens), M. condoni, M. equiceps (syn. Anchitherium brachylophum, Mesohippus acutidens), M. equinanus, M. gemmarosae, M. gidleyi (syn. Mesohippus grallipes, M. validus), M. grandis, M. intermedius, M. obliquidens (syn. Mesohippus meteulophus, Mesohippus eulophus, Mesohippus brachystylus, Pediohippus antiquus), M. primus, M. quartus, M. taxus

Species lacking formal opinion data

M. assinoboiensis

Entered

by J. Alroy on 2003-01-23; modified by M. Carrano on 2019-09-04

Synonyms

Altippus was named by Douglass (1908).

It was synonymized subjectively with Parahippus by Osborn (1918) and Hay (1930); it was synonymized subjectively with Miohippus by Schlaikjer (1937), Stirton (1940), Jahns (1940).
Anchitherium condoni was named by Leidy (1870).

It was recombined as Mesohippus condoni by Matthew (1899) and Merriam (1907); it was considered a nomen dubium by Osborn (1918); it was recombined as Miohippus condoni by Marsh (1874), King (1878), Roger (1896), Trouessart (1898), Hay (1902), Osborn (1904), Matthew (1909), Hay (1930), Stirton (1940).
Anchitherium longicristis was named by Cope (1878) [also said to be 1879].

It was recombined as Miohippus longicristis by Cope (1894), Scott (1895), Roger (1896), Trouessart (1898), Hay (1902), Hay (1930), Stirton (1940); it was recombined as Mesohippus longicristis by Matthew (1899), Osborn (1904), Merriam and Sinclair (1907); it was considered a nomen dubium by Osborn (1918), Macdonald (1992).
Pediohippus was named by Schlaikjer (1935). Its type is Pediohippus antiquus.

It was synonymized subjectively with Mesohippus by Stirton (1940); it was synonymized subjectively with Miohippus by Forsten (1974), Prothero and Shubin (1989), MacFadden (1998).

Synonymy list

Year	Name and author
1870	Anchitherium condoni Leidy p. 112
1873	Anchitherium condoni Leidy p. 218
1874	Miohippus Marsh
1874	Miohippus condoni Marsh
1874	Miohippus Marsh p. 249
1878	Anchitherium longicristis Cope p. 75
1878	Miohippus condoni King
1879	Anchitherium longicriste Cope p. 58
1894	Miohippus longicristis Cope p. 791
1895	Miohippus longicristis Scott
1896	Miohippus condoni Roger
1896	Miohippus longicristis Roger
1898	Miohippus condoni Trouessart
1898	Miohippus longicristis Trouessart
1899	Mesohippus condoni Matthew
1899	Mesohippus longicristis Matthew
1902	Miohippus Hay p. 612
1902	Miohippus condoni Hay p. 613
1902	Miohippus longicristis Hay p. 614
1904	Mesohippus longicristis Osborn p. 168
1904	Miohippus condoni Osborn p. 168
1907	Mesohippus condoni Merriam
1907	Mesohippus longicristis Merriam and Sinclair
1908	Altippus Douglass
1909	Miohippus condoni Matthew
1913	Miohippus Scott p. 290
1918	Miohippus Osborn
1930	Miohippus Hay
1930	Miohippus condoni Hay
1930	Miohippus longicristis Hay p. 677
1935	Pediohippus Schlaikjer
1940	Miohippus Stirton
1940	Miohippus condoni Stirton p. 172
1940	Miohippus longicristis Stirton p. 172
1988	Miohippus Carroll
1989	Miohippus Prothero and Schoch p. 531
1998	Miohippus MacFadden p. 544
2020	Miohippus Lofgren et al.

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Rank	Name	Author
kingdom	Animalia	()
—	Bilateria
—	Eubilateria	Ax 1987
—	Deuterostomia
phylum	Chordata	Haeckel 1874
subphylum	Vertebrata
superclass	Gnathostomata
class	Osteichthyes
subclass	Sarcopterygii	()
subclass	Dipnotetrapodomorpha	(Nelson 2006)
subclass	Tetrapodomorpha	()
—	Tetrapoda
—	Reptiliomorpha
—	Anthracosauria
subclass	Amphibiosauria	Kuhn 1967
—	Cotylosauria	()
—	Amniota
subclass	Synapsida
—	Therapsida	()
infraorder	Cynodontia	()

Rank	Name	Author
—	Mammaliamorpha
—	Mammaliaformes
class	Mammalia
—	Cladotheria
—	Zatheria
subclass	Tribosphenida	()
subclass	Theria
—	Eutheria	()
—	Placentalia
—	Boreoeutheria
—	Laurasiatheria
—	Scrotifera
—	Euungulata
—	Panperissodactyla
superorder	Perissodactylamorpha
order	Perissodactyla	()
superfamily	Equoidea
family	Equidae
subfamily	Anchitheriinae	()
genus	Miohippus

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. †Miohippus Marsh 1874

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†Miohippus anceps Marsh 1874

†Miohippus annectens Marsh 1874

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Invalid names: Miohippus crassicuspis Osborn 1904 [synonym]

†Miohippus assiniboiensis Lambe 1905

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Invalid names: Mesohippus planidens Lambe 1905 [synonym]

†Miohippus equiceps Cope 1878

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Invalid names: Anchitherium brachylophum Cope 1878 [synonym], Mesohippus acutidens Sinclair 1905 [synonym]

†Miohippus equinanus Osborn 1918

†Miohippus gemmarosae Osborn 1918

†Miohippus gidleyi Osborn 1904

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Invalid names: Mesohippus grallipes Sinclair 1925 [synonym], Miohippus validus Osborn 1904 [synonym]

†Miohippus grandis Clark and Beerbower 1967

†Miohippus intermedius Osborn and Wortman 1895

†Miohippus obliquidens Osborn 1904

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Invalid names: Mesohippus brachystylus Osborn 1904 [synonym], Mesohippus eulophus Osborn 1904 [synonym], Mesohippus meteulophus Osborn 1904 [synonym], Pediohippus antiquus Schlaikjer 1935 [synonym]

†Miohippus primus Osborn 1918

†Miohippus quartus Osborn 1918

†Miohippus taxus Douglass 1908

Invalid names: Altippus Douglass 1908 [synonym], Anchitherium longicristis Cope 1878 [nomen dubium], Miohippus condoni Leidy 1870 [nomen dubium], Pediohippus Schlaikjer 1935 [synonym]

Diagnosis

No diagnoses are available