PBDB Taxon

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Mylohyus fossilis

Mammalia - Tayassuidae

Taxonomy

Dicotyles fossilis was named by Leidy (1860) [status unclear in light of Wright 1998]. Its type specimen is ANSP 11509, a set of teeth (five isolated teeth), and it is a 3D body fossil.

It was synonymized subjectively with Mylohyus nasutus by Kurten and Anderson (1980); it was recombined as Mylohyus fossilis by Lundelius (1960), Westgate and Messick (1985), Hulbert and Pratt (1998), Wright (1998), Albright et al. (2019) and Prothero (2021).

Sister species lacking formal opinion data

M. lenis

Synonyms

Dicotyles pennsylvanicus was named by Leidy (1889).

It was recombined as Tayassu pennsylvanicus by Hay (1902); it was recombined as Mylohyus pennsylvanicus by Gidley (1920) and Allen (1926); it was synonymized subjectively with Mylohyus nasutus by Lundelius (1960), Semken and Griggs (1965) and Kurten and Anderson (1980); it was synonymized subjectively with Mylohyus fossilis by Westgate and Messick (1985).
Mylohyus browni was named by Gidley (1920). Its type specimen is USNM 11810, a mandible, and it is a 3D body fossil.

It was synonymized subjectively with Mylohyus nasutus by Lundelius (1960), Semken and Griggs (1965) and Kurten and Anderson (1980); it was synonymized subjectively with Mylohyus fossilis by Westgate and Messick (1985).
Mylohyus exortivus was named by Gidley (1920). Its type specimen is USNM 8876, a mandible, and it is a 3D body fossil. Its type locality is Cumberland Cave, which is in an Irvingtonian cave horizon in Maryland.

It was synonymized subjectively with Mylohyus nasutus by Kurten and Anderson (1980); it was synonymized subjectively with Mylohyus fossilis by Lundelius (1960) and Westgate and Messick (1985).
Mylohyus gidleyi was named by Simpson (1929). Its type specimen is AMNH 23504, a mandible, and it is a 3D body fossil. Its type locality is Seminole Field, which is in a Pleistocene fluvial sandstone in Florida.

It was synonymized subjectively with Mylohyus nasutus by Kurten and Anderson (1980); it was synonymized subjectively with Mylohyus fossilis by Lundelius (1960), Kinsey (1974) and Westgate and Messick (1985).
Mylohyus temerarius was named by Hay (1914).

It was considered a nomen dubium by Lundelius (1960); it was synonymized subjectively with Mylohyus fossilis by Prothero (2021).
Mylohyus tetragonus was named by Cope (1899) [treated as valid by Lundelius 1960].

It was recombined as Tayassu tetragonus by Hay (1902); it was synonymized subjectively with Mylohyus nasutus by Kurten and Anderson (1980); it was synonymized subjectively with Mylohyus fossilis by Westgate and Messick (1985).

Synonymy list

Year	Name and author
1860	Dicotyles fossilis Leidy p. 108
1889	Dicotyles pennsylvanicus Leidy
1899	Mylohyus tetragonus Cope
1902	Tayassu pennsylvanicus Hay p. 659
1902	Tayassu tetragonus Hay p. 660
1914	Mylohyus temerarius Hay
1920	Mylohyus pennsylvanicus Gidley p. 674
1920	Mylohyus browni Gidley p. 675
1920	Mylohyus tetragonus Gidley p. 675
1920	Mylohyus exortivus Gidley p. 676
1926	Mylohyus pennsylvanicus Allen
1929	Mylohyus gidleyi Simpson
1960	Mylohyus fossilis Lundelius, Jr.
1985	Mylohyus fossilis Westgate and Messick
1998	Mylohyus fossilis Hulbert, Jr. and Pratt
1998	Mylohyus fossilis Wright
2019	Mylohyus fossilis Albright et al. p. 188
2021	Mylohyus fossilis Prothero p. 49

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Rank	Name	Author
kingdom	Animalia	()
—	Bilateria
—	Eubilateria	Ax 1987
—	Deuterostomia
phylum	Chordata	Haeckel 1874
subphylum	Vertebrata
superclass	Gnathostomata
—	Osteichthyes	()
subclass	Sarcopterygii	()
subclass	Dipnotetrapodomorpha	(Nelson 2006)
subclass	Tetrapodomorpha	()
—	Tetrapoda
—	Reptiliomorpha
—	Anthracosauria
subclass	Amphibiosauria	Kuhn 1967
—	Cotylosauria	()
—	Amniota
subclass	Synapsida
—	Therapsida	()
infraorder	Cynodontia	()
—	Mammaliamorpha
—	Mammaliaformes

Rank	Name	Author
class	Mammalia
—	Theriamorpha	(Rowe 1993)
—	Theriiformes	()
—	Trechnotheria
—	Cladotheria
—	Zatheria
subclass	Tribosphenida	()
subclass	Theria
—	Eutheria	()
—	Placentalia
—	Boreoeutheria
—	Laurasiatheria
—	Scrotifera
—	Euungulata
—	Artiodactylamorpha
—	Artiodactyla	()
superfamily	Suoidea
—	Suina	(Gray 1868)
family	Tayassuidae
genus	Mylohyus	Cope 1869
species	fossilis	(Leidy 1860)

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.

†Mylohyus fossilis Leidy 1860

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Invalid names: Dicotyles pennsylvanicus Leidy 1889 [synonym], Mylohyus browni Gidley 1920 [synonym], Mylohyus exortivus Gidley 1920 [synonym], Mylohyus gidleyi Simpson 1929 [synonym], Mylohyus temerarius Hay 1914 [synonym], Mylohyus tetragonus Cope 1899 [synonym]

Diagnosis

No diagnoses are available