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Xenicohippus grangeri

Mammalia - Perissodactyla - Equidae

Taxonomy
Xenicohippus grangeri was named by Bown and Kihm (1981) [genotype]. Its type specimen is USGS 292, a mandible (right & left mandible fragments with P2–P4), and it is a 3D body fossil.

Synonymy list
YearName and author
1981Xenicohippus grangeri Bown and Kihm
1998Xenicohippus grangeri MacFadden p. 542
2002Xenicohippus grangeri Froehlich p. 174

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RankNameAuthor
kingdomAnimalia()
Triploblastica
Nephrozoa
Deuterostomia
phylumChordataHaeckel 1847
OlfactoresJefferies 1991
subphylumVertebrata
Gnathostomata()
Osteichthyes()
Sarcopterygii
subclassDipnotetrapodomorpha(Nelson 2006)
subclassTetrapodomorpha()
Tetrapoda()
Reptiliomorpha
Anthracosauria
Batrachosauria()
Cotylosauria()
Amniota
Synapsida()
RankNameAuthor
Therapsida()
infraorderCynodontia()
Epicynodontia
infraorderEucynodontia
Probainognathia
Mammaliamorpha
Mammaliaformes
classMammalia
subclassTribosphenida()
infraclassEutheria()
Placentalia
orderPerissodactyla()
suborderLophodontomorpha
infraorderEuperissodactyla
Hippomorpha
superfamilyEquoidea
familyEquidae
genusXenicohippus
speciesgrangeri

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.

Diagnosis
ReferenceDiagnosis
D. J. Froehlich 2002Xenicohippus grangeri has all of the synapomorphies of the derived Xenicohippus clade: P2 large and relatively blade-like (Character 68, 0 to 1), P3 > 20% smaller than M1 linear dimensions (Character 71, 0 to 1), P4 entoconid always present (Character 75, 1 to 2), and lower molar paracristid a 30° to long axis of tooth (Character 87, 1 to 2), but lacks any autapomorphies in this analysis. It can be distinguished from Xenicohippus osborni by the relative size and morphology of the anterior premolars, specifically: P2 with postero-basal cusp, P3 relatively smaller than in X. osborni with weak metaconid, P4 relatively smaller than in X. osborni, and P4 and M1 about equal in size.