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Pliohippus tehonensis

Mammalia - Perissodactyla - Equidae

Taxonomy
Protohippus tehonensis was named by Merriam (1915) [also said to be 1916]. Its type specimen is UCMP 21779, a tooth (left M1), and it is a 3D body fossil. Its type locality is South Tejon Hills, which is in a Clarendonian terrestrial horizon in the "Santa Margarita" Formation of California.

It was recombined as Pliohippus (Pliohippus) tehonensis by Stirton (1940); it was recombined as Dinohippus tehonensis by Hulbert (1993); it was synonymized subjectively with Pliohippus fairbanksi by MacFadden (1998); it was considered a nomen dubium by Kelly (1995); it was recombined as Pliohippus tehonensis by Drescher (1941) and Kelly (1998).

Synonymy list
YearName and author
1915Protohippus tehonensis Merriam
1918Protohippus tehonensis Osborn p. 138 figs. Text Fig. 111
1940Pliohippus (Pliohippus) tehonensis Stirton p. 192
1941Pliohippus tehonensis Drescher
1993Dinohippus tehonensis Hulbert, Jr.
1998Pliohippus tehonensis Kelly

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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
genusPliohippus
speciestehonensis()

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
H. F. Osborn 1918(Merriam, 1915, Osborn, 1918) (1) Protocone and hypocone in the same longitudinal plane; (2)
from the crochet region a pli cahallin, a prominent crochet fold projecting into the prefossette; (3) a prominent fold projecting into the postfossette; (4) pre- and postfossettes triangular in form.