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Pliohippus (Astrohippus)

Mammalia - Perissodactyla - Equidae

Synonymy list
YearName and author
1940Pliohippus (Astrohippus) Stirton p. 190
1950Pliohippus (Astrohippus) Lance
1955Astrohippus Quinn p. 40
1968Astrohippus Mooser p. 1
1975Pliohippus (Astrohippus) Forsten p. 48
1986Astrohippus MacFadden p. 467
1988Astrohippus Carroll
1989Astrohippus Prothero and Schoch p. 532
1991Astrohippus Baskin p. 999
1995Astrohippus Kelly p. 15
1996Astrohippus Prado and Alberdi p. 676
1998Astrohippus MacFadden p. 551

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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
tribeEquini
genusPliohippus
subgenusAstrohippus

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.

Subg. †Pliohippus (Astrohippus) Stirton 1940
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Diagnosis
ReferenceDiagnosis
J. H. Quinn 1955Upper cheek teeth slender, _hypsodont, and straight crowned; enamel pattern simple; fossettes transversely compressed and small; protocones variably grooved internally and heeled anteriorly; hypoconal groove closed nearly to sum- mit of crown; lower teeth with attenuated, divergent metaconid and metastylid; on molars metaconid and metastylid attached by a long narrow commissure as in the premolars; median valley not penetrating between the reentrants of the flexids on either premolars, or molars; parastylid present on early species, lost or nearly so on late species.