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Pseudhipparion curtivallum

Mammalia - Perissodactyla - Equidae

Taxonomy
Astrohippus curtivallis was named by Quinn (1955) [Type locality is 18611]. Its type specimen is BEG 30896-196, a mandible (wer jaw fragment with p4-m2), and it is a 3D body fossil.

It was synonymized subjectively with Calippus anatinus by Webb (1969); it was recombined as Pseudhipparion curtivallum by Forsten (1975), Webb and Hulbert (1986) and MacFadden (1998).

Synonymy list
YearName and author
1955Astrohippus curtivallis Quinn p. 40
1975Pseudhipparion curtivallum Forsten
1986Pseudhipparion curtivallum Webb and Hulbert, Jr.
1998Pseudhipparion curtivallum MacFadden p. 548

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RankNameAuthor
kingdomAnimalia()
Triploblastica
Nephrozoa
Deuterostomia
phylumChordataHaeckel 1847
subphylumVertebrata
superclassGnathostomata
Osteichthyes()
Sarcopterygii
subclassDipnotetrapodomorpha(Nelson 2006)
subclassTetrapodomorpha()
Tetrapoda()
Reptiliomorpha
Anthracosauria
Batrachosauria()
Cotylosauria()
Amniota
Synapsida()
Therapsida()
infraorderCynodontia()
RankNameAuthor
Epicynodontia
infraorderEucynodontia
Probainognathia
Mammaliamorpha
Mammaliaformes
classMammalia
subclassTribosphenida()
infraclassEutheria()
Placentalia
orderPerissodactyla()
suborderLophodontomorpha
infraorderEuperissodactyla
Hippomorpha
superfamilyEquoidea
familyEquidae
subfamilyEquinaeSteinmann and Döderlein 1890
tribeHipparionini
genusPseudhipparionAmeghino 1904
speciescurtivallum()

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 1955maller than A. ansae; paralophid short and thick; flexids long and deep; metaconid and metastylid at- tenuated with metaconid longer than meta- stylid; entoconid elongate; parastylid present; median valley of molars short- ened; long narrow commissure between reentrants of flexids as on premolars; pro- toconid and hypoconid flattened on mo- lars; referred upper teeth straight crowned, slender; simple enamel pattern; small compressed fossettes; protocone without heel or groove.