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Astrohippus ansae

Mammalia - Perissodactyla - Equidae

Taxonomy
Protohippus ansae was named by Matthew and Stirton (1930). Its type specimen is UCMP 30225, a mandible (OOwer jaw with p2-m3 moderately worn.), and it is a 3D body fossil. Its type locality is Coffee Ranch, which is in a Hemphillian terrestrial horizon in Texas. It is the type species of Pliohippus (Astrohippus).

It was recombined as Calippus ansae by Stirton (1935), Hesse (1936) and Savage (1941); it was recombined as Pliohippus ansae by Johnston (1937); it was recombined as Pliohippus (Astrohippus) ansae by Stirton (1940); it was recombined as Astrohippus ansae by Quinn (1955), Webb (1969), Bennett (1979), Dalquest (1983), MacFadden (1984) and MacFadden (1998).

Synonymy list
YearName and author
1930Protohippus ansae Matthew and Stirton p. 361 figs. Plates, 53, 54, 55
1935Calippus ansae Stirton
1936Calippus ansae Hesse
1937Pliohippus ansae Johnston
1940Pliohippus (Astrohippus) ansae Stirton p. 190
1941Calippus ansae Savage
1955Astrohippus ansae Quinn p. 40
1969Astrohippus ansae Webb
1979Astrohippus ansae Bennett
1983Astrohippus ansae Dalquest
1984Astrohippus ansae MacFadden
1998Astrohippus ansae 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
genusAstrohippus()
speciesansae()

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
W. D. Matthew and R. A. Stirton 1930Size of P. pertUtu.s, teeth higher crowned and less
curved, transverse width relatively less, especially in premolars (in contrast to P. secu.ndu.s); mesostyle much heavier; cement lakes simple without enamel inflec- tions. In the lower teeth the metaconid and metastylid are oval to rounded in outline, the intervening valley narrowed or fading out toward base of tooth, the outer crescents rounded to flattened.