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Pliohippus coalingensis

Mammalia - Perissodactyla - Equidae

Taxonomy
Protohippus coalingensis was named by Merriam (1914). Its type specimen is UCMP 21341, a tooth (A fourth superior premolar, p4, of the right side), and it is a 3D body fossil. Its type locality is Mack Pumping Plant, site 2, which is in a Pliocene terrestrial horizon in the Etchegoin Formation of California.

It was recombined as Pliohippus (Pliohippus) coalingensis by Stirton (1940); it was synonymized subjectively with Pliohippus interpolatus by James (1963); it was recombined as Dinohippus coalingensis by Tedford et al. (1987) and Kelly and Lander (1988); it was considered a nomen dubium by Matthew and Stirton (1930), Macdonald (1992) and Kelly (1998); it was recombined as Pliohippus coalingensis by Merriam (1915), Osborn (1918), Merriam (1919), Hay (1930) and MacFadden (1998).

Synonymy list
YearName and author
1914Protohippus coalingensis Merriam
1915Pliohippus coalingensis Merriam
1918Pliohippus coalingensis Osborn p. 165 figs. Text Figs. 133
1919Pliohippus coalingensis Merriam
1930Pliohippus coalingensis Hay
1940Pliohippus (Pliohippus) coalingensis Stirton p. 192
1987Dinohippus coalingensis Tedford et al.
1988Dinohippus coalingensis Kelly and Lander
1998Pliohippus coalingensis MacFadden p. 550

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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
speciescoalingensis()

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, 1914, 1915) (1) Type belonging to an animal of medium size, approaching in dimensions
Pliohippua aupremua. (2) Dilfers from P . aupremua in the heavier mesostyle, relative narrowness (in transverse diameter) of the crown even toward the base, narrower fossettes, much less plicated enamel walls of fossettes, much smaller, more nearly circular protocone. (3) Resembles P. 'jairbankai of the Ricardo approximately in size, in simplicity of fossettes, in the very small, round protocone, and weak connection of the protoloph and metaloph; (4) differs from P. fairbankai in the narrower and less curved crown of the molar teeth, the being apparently a normal char- acter of worn teeth; (5) possibly separated only by subspecific characters from P. fairbankai. (6) A larger"il.nd more progressive stage than the Pliohippus or Protohippus species of the Jacalitos.