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Perchoerus nanus

Mammalia - Artiodactyla - Tayassuidae

Taxonomy
Thinohyus nanus was named by Marsh (1894) [also said to be 1892]. Its type specimen is YPM 11784, a mandible, and it is a 3D body fossil.

It was synonymized subjectively with Perchoerus probus by Pearson (1923); it was considered a nomen dubium by Wright (1998); it was recombined as Perchoerus nanus by Hay (1902), Scott (1940) and Prothero (2009).

Synonymy list
YearName and author
1894Thinohyus nanus Marsh p. 271
1902Perchoerus nanus Hay
1940Perchoerus nanus Scott p. 502
2009Perchoerus nanus Prothero p. 515

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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()
RankNameAuthor
Cotylosauria()
Amniota
Synapsida()
Therapsida()
infraorderCynodontia()
Epicynodontia
infraorderEucynodontia
Probainognathia
Mammaliamorpha
Mammaliaformes
classMammalia
orderArtiodactyla()
superfamilySuoidea
familyTayassuidae
genusPerchoerusLeidy 1869
speciesnanus()

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
D. R. Prothero 2009medium-size species of Perchoerus (ml-3 length = 38-44 mm); distinguished from P. minor by its larger size, slightly larger teeth, and more elongate and complex hypoconulid on m3; distinguished from P. probus by its much smaller size, slightly smaller cheek teeth, trapezoid-shaped upper molars, much smaller M3 with a reduced metacone and posterior cingulum, and shorter m3 hypoconulid with more complex cusp patterns.