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Merychippus isonesus quintus

Mammalia - Perissodactyla - Equidae

Taxonomy
Merychippus isonesus quintus was named by Osborn (1918) [named as Merychippus isonesus quintus by Osborn 1918; raised to species level]. Its type specimen is AMNH 14185, a partial skeleton (Upper and lower dentition and a large part of a skeleton), and it is a 3D body fossil.

It was recombined as Stylonus quintus by Kelly and Lander (1988); it was recombined as Merychippus quintus by Dorr and Wheeler (1964) and Kelly (1995).

Synonymy list
YearName and author
1918Merychippus isonesus quintus Osborn p. 107 figs. Plates 13.7,7a, 14.1, 41.4, 45.2,5, 46.4. Text Fig. 81
1964Merychippus quintus Dorr, Jr. and Wheeler p. 323
1988Stylonus quintus Kelly and Lander
1995Merychippus quintus 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
genusMerychippus
speciesisonesus()
subspeciesquintus

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 (Matthew, 1913, Osborn, 1918) (1) The type a larger animal than any of the preceding premutations, approaching M. sever8U8 in the plications of tne enamel; (2) crochet bifid, i. e. with a large spur projecting into the pre- fossette and a large inferior pli caballin fold; (3) protocone separate from protoconule in little worn molars, uniting with protoconule in molars one-fourth worn; (4) protocone elongate anteroposteriorly in pLm3; (5) metaloph sending a single fold into prefossette, and from one to two folds into postfossette; (6) shafts of limbs robust; (7) metapodials robust; (8) shafts of lateral digits and lateral phalanges much heavier than in M. isone8WJ secundus and M. isonesus tertius.