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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), MacFadden (1998) and May (2019).

Synonymy list
YearName and author
1955Astrohippus curtivallis Quinn p. 40 figs. Pl. 7, Figs. 7 - 9
1975Pseudhipparion curtivallum Forsten
1986Pseudhipparion curtivallum Webb and Hulbert, Jr.
1998Pseudhipparion curtivallum MacFadden p. 548
2019Pseudhipparion curtivallum May

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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
—Mammaliaformes
classMammalia
RankNameAuthor
—Theriamorpha(Rowe 1993)
—Theriiformes()
—Trechnotheria
—Cladotheria
—Zatheria
subclassTribosphenida()
subclassTheria
—Eutheria()
—Placentalia
—Boreoeutheria
—Laurasiatheria
—Scrotifera
—Euungulata
—Panperissodactyla
superorderPerissodactylamorpha
orderPerissodactyla()
superfamilyEquoidea
familyEquidae
subfamilyEquinae
tribeHipparionini
genusPseudhipparion
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.

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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.