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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()
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
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.

Pliohippus tehonensis Merriam 1915
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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.