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Protohippus vetus

Mammalia - Perissodactyla - Equidae

Taxonomy
Protohippus vetus was named by Quinn (1955) [type locality is 18608]. Its type specimen is BEG 31242-71, a maxilla (ght and left maxilla lacking the right P2), and it is a 3D body fossil.

It was recombined as Merychippus vetus by Forsten (1975).

Synonymy list
YearName and author
1955Protohippus vetus Quinn p. 17 figs. Pl. 1, Figs. 14 - 16
1975Merychippus vetus Forsten
1988Protohippus vetus Hulbert, Jr. p. 281
1998Protohippus vetus MacFadden p. 550

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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()
Therapsida()
RankNameAuthor
infraorderCynodontia()
Epicynodontia
infraorderEucynodontia
Probainognathia
Mammaliamorpha
Mammaliaformes
classMammalia
subclassTribosphenida()
infraclassEutheria()
Placentalia
orderPerissodactyla()
suborderLophodontomorpha
infraorderEuperissodactyla
Hippomorpha
superfamilyEquoidea
familyEquidae
subfamilyEquinaeSteinmann and Döderlein 1890
tribeEquini
genusProtohippus()
speciesvetus

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
J. H. Quinn 1955per cheek tooth series approximately the same length as P. per- ditus; teeth lower crowned, narrower transversely, enamel pattern more com- plex than in P. perditus; ectoloph flat- tened with styles and ribs strongly de- veloped; protocones long-oval and disconnected at the summit of the crowns; pli caballin on all cheek teeth in early stages of wear, lost with wear on molars · but not on premolars; bifurcate on some premolars; hypostylar fossette present on molars; lower cheek tooth pattern simi- lar to that of Hippodon; parastylid slop- ing diagonally across anterior face of teeth.