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Hypohippus affinis

Mammalia - Perissodactyla - Equidae

Taxonomy
Anchitherium (Hypohippus) affinis was named by Leidy (1858) [type of subgenus Hypohippus]. It is a 3D body fossil. Its type locality is TMM 40282, which is in a Clarendonian terrestrial horizon in Texas. It is the type species of Hypohippus.

It was recombined as Hypohippus affinis by Leidy (1858), Leidy (1869), Hay (1902), Gidley (1907), Osborn (1918), Stirton (1940), Forsten (1975) and MacFadden (1998).

Synonymy list
YearName and author
1858Anchitherium (Hypohippus) affinis Leidy
1858Hypohippus affinis Leidy
1858Anchitherium (Hypohippus) affinis Leidy p. 26
1869Hypohippus affinis Leidy p. 311
1902Hypohippus affinis Hay p. 615
1907Hypohippus affinis Gidley p. 879
1918Hypohippus affinis Osborn
1940Hypohippus affinis Stirton p. 175
1975Hypohippus affinis Forsten p. 12
1998Hypohippus affinis 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
RankNameAuthor
—Mammaliaformes
classMammalia
—Cladotheria
—Zatheria
subclassTribosphenida()
subclassTheria
—Eutheria()
—Placentalia
—Boreoeutheria
—Laurasiatheria
—Scrotifera
—Euungulata
—Panperissodactyla
superorderPerissodactylamorpha
orderPerissodactyla()
superfamilyEquoidea
familyEquidae
subfamilyAnchitheriinae()
genusHypohippus()
speciesaffinis()

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.

†Hypohippus affinis Leidy 1858
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Diagnosis
ReferenceDiagnosis
A. -M. Forsten 1975Leidy (1858), according to Gidley (1907), revised: cheek teeth brachyodont, lophodont. Uppers with metaloph united to ectoloph, slight protoconule, metaconule submerged; protocone and hypocone large, conical; paracone and metacone concave, no ribbing; crochet variable, disconnected; hypostyle variable.. Lowers with metaconid and metastylid divided by a notch in the premolars, barely divided or undivided in the molars. Cingulum variable, cement none. M3/3 relatively reduced.
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: Nowak 1991, Hendy et al. 2009, Lillegraven 1979, Carroll 1988, Ji et al. 2002

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

Collections (22 total)


Time interval Ma Country or state Original ID and collection number
Miocene23.03 - 5.333USA (Texas) Hypohippus affinis (18638 18709)
Barstovian16.3 - 12.5USA (Nebraska) Hypohippus affinis (18232 18443)
Barstovian16.3 - 12.5USA (California) Hypohippus affinis (19472) Hypohippus sp. (19432 19548)
Barstovian16.3 - 12.5USA (Nevada) Hypohippus affinis (19097)
Barstovian16.3 - 12.5USA (New Mexico) Hypohippus affinis (19287)
Barstovian - Clarendonian16.3 - 9.4USA (Nebraska) Anchitherium affinis (190543) Hypohippus affinis (18077)
Clarendonian12.5 - 9.4USA (Texas) Hypohippus affinis (18179 18244 18355 type locality: 18703) Hypohippus sp. (18610)
Clarendonian12.5 - 9.4USA (Nebraska) Hypohippus affinis (18106 18176 18230 18233)
Clarendonian - Hemphillian12.5 - 4.9USA (Wyoming) Hypohippus sp. (18424)
Tortonian - Zanclean11.62 - 3.6USA (Florida) Hypohippus affinis (18501)