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Aepinacodon americanus

Mammalia - Anthracotheriidae

Taxonomy
Hyopotamus americanus was named by Leidy (1856) [original combination!]. It is a 3D body fossil. Its type locality is Peanut Peak, which is in a Chadronian terrestrial horizon in the Chadron Formation of South Dakota.

It was recombined as Choeropotamus (Hyopotamus) americanus by Leidy (1857); it was recombined as Ancodus americanus by Scott (1895); it was recombined as Ancodon americanus by Hay (1902), Matthew (1909) and Cook (1912); it was recombined as Bothriodon americanus by Scott (1940); it was recombined as Aepinacodon americanus by Troxell (1921), Hay (1930), Clark (1937), Macdonald (1956), Russell (1978) and Kron and Manning (1998).

Synonymy list
YearName and author
1856Hyopotamus americanus Leidy p. 59
1857Choeropotamus (Hyopotamus) americanus Leidy p. 89
1869Hyopotamus americanus Leidy
1871Hyopotamus americanus Leidy
1878Hyopotamus americanus King
1894Hyopotamus americanus Osborn and Wortman
1895Ancodus americanus Scott
1899Hyopotamus americanus Matthew
1901Hyopotamus americanus Matthew
1902Ancodon americanus Hay p. 652
1909Ancodon americanus Matthew p. 1
1909Hyopotamus americanus Osborn
1910Hyopotamus americanus O'Harra
1912Ancodon americanus Cook
1912Hyopotamus americanus Deperet
1920Hyopotamus americanus O'Harra
1921Aepinacodon americanus Troxell p. 334
1930Aepinacodon americanus Hay
1937Aepinacodon americanus Clark
1940Bothriodon americanus Scott p. 463 figs. Plate XLV, Figs. 1-3
1956Aepinacodon americanus Macdonald p. 619
1978Aepinacodon americanus Russell
1998Aepinacodon americanus Kron and Manning

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RankNameAuthor
kingdomAnimalia()
Bilateria
EubilateriaAx 1987
Life
Deuterostomia
phylumChordataHaeckel 1874
subphylumVertebrata
superclassGnathostomata
Osteichthyes()
subclassSarcopterygii()
subclassDipnotetrapodomorpha(Nelson 2006)
subclassTetrapodomorpha()
Tetrapoda
Reptiliomorpha
Anthracosauria
subclassAmphibiosauriaKuhn 1967
Cotylosauria()
Amniota
subclassSynapsida
Therapsida()
infraorderCynodontia()
Mammaliamorpha
RankNameAuthor
Mammaliaformes
classMammalia
Theriamorpha(Rowe 1993)
Theriiformes()
Trechnotheria
Cladotheria
Zatheria
subclassTribosphenida()
subclassTheria
Eutheria()
Placentalia
Boreoeutheria
Laurasiatheria
Scrotifera
Euungulata
Artiodactylamorpha
Artiodactyla()
Whippomorpha
superfamilyHippopotamoideaGray 1821
familyAnthracotheriidaeLeidy 1869
genusAepinacodon
speciesamericanus()

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.

Aepinacodon americanus Leidy 1856
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Diagnosis
ReferenceDiagnosis
J. R. Macdonald 1956M2-3 with posterior cingulum from linguad of crest of hypocone to base of meiastyle; mesostyle broad, curves lingually over end of transverse valley which has pointed lingual end; enamel heavily crenu- lated. P4compressed antero-posteriorly on labial side, no lingual cingulum