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Miohippus anceps

Osteichthyes - Perissodactyla - Equidae

Taxonomy
Anchitherium anceps was named by Marsh (1874). Its type specimen is YPM 11285 and is a 3D body fossil.

It was recombined as Mesohippus anceps by Matthew (1899), Merriam and Sinclair (1907); it was recombined as Kalobatippus anceps by Joleaud (1919); it was recombined as Miohippus anceps by King (1878), Marsh (1892), Roger (1896), Trouessart (1898), Hay (1902), Osborn (1904), Osborn (1918), Stirton (1940).

Sister species lacking formal opinion data
M. assinoboiensis
Entered
by J. Alroy on 2003-01-23; modified by J. Marcot on 2017-12-21

Synonymy list
YearName and author
1874Anchitherium anceps Marsh p. 249
1878Miohippus anceps King
1886Anchitherium anceps Cope
1892Miohippus anceps Marsh
1893Anchitherium anceps Zittel
1896Miohippus anceps Roger
1898Miohippus anceps Trouessart
1899Mesohippus anceps Matthew
1902Miohippus anceps Hay p. 613
1904Miohippus anceps Osborn p. 168
1907Mesohippus anceps Merriam and Sinclair p. 186
1918Miohippus anceps Osborn p. 58 figs. Text Fig. 36
1919Kalobatippus anceps Joleaud
1940Miohippus anceps Stirton p. 172

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RankNameAuthor
kingdomAnimalia()
—Bilateria
—EubilateriaAx 1987
—Deuterostomia
phylumChordataHaeckel 1874
subphylumVertebrata
superclassGnathostomata
classOsteichthyes
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
speciesanceps()

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 anceps Marsh 1874
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Diagnosis
ReferenceDiagnosis
H. F. Osborn 1918(Marsh, p. 250) The author observed that the remains of this species indicate (1) an animal about as large as a sheep. (2) It differs from Mesohippus (A .) bairdii in its larger size. (3) The limbs so far as known are similar to those of Anchitherium. (4) Skull has a large antorbital fossa; (5) skull depressed between the orbits; (6) the antorbital foramen is above the centre of the third premolar; (7) Malar extending farther back below the orbit. (8) Lower teeth agree essentially with those of Anchitherium,· (9) ex- ternal cusps of upper molars with stouter buttresses; (10) concavities between them divided by more prominent vertical ridges. (Lull, letter October 23,
1915) " Marsh's description of Anchitherium anceps calls for more data than this specimen [Type, Yale Mus. 11285] can furnish. One second skull (green matrix) wJ:l.ich could have been seen by him does not tally accurately with his description though I have always supposed it to be A. anceps."
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, Hendy et al. 2009, Lillegraven 1979, Nowak 1991, Ji et al. 2002

Age range: Arikareean or 29.50000 to 18.50000 Ma

Collections: one only


Time interval Ma Country or state Original ID and collection number
Arikareean29.5 - 18.5USA (Montana) Miohippus anceps (17509)