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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
—Deuterostomia
phylumChordataHaeckel 1874
subphylumVertebrata
superclassGnathostomata
—Osteichthyes()
subclassSarcopterygii()
subclassDipnotetrapodomorpha(Nelson 2006)
subclassTetrapodomorpha()
—Tetrapoda
—Reptiliomorpha
—Anthracosauria
subclassAmphibiosauriaKuhn 1967
—Cotylosauria()
—Amniota
subclassSynapsida
—Therapsida()
infraorderCynodontia()
RankNameAuthor
—Mammaliamorpha
—Mammaliaformes
classMammalia
—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
Measurements
No measurements are available
Composition: phosphaticsubp
Environment: terrestrialo
Locomotion: actively mobilec
Life habit: ground dwellingf
Diet: browserf
Reproduction: viviparoussubc
Created: 2005-08-31 14:33:14
Modified: 2005-08-31 16:33:14
Source: f = family, o = order, subc = subclass, c = class, subp = subphylum
References: Carroll 1988, Lillegraven 1979, Hendy et al. 2009, Kron and Manning 1998, Nowak 1999

Age range: base of the Chadronian to the top of the Orellan or 37.20000 to 33.30000 Ma

Collections (5 total)


Time interval Ma Country or state Original ID and collection number
Chadronian37.2 - 33.9USA (Nebraska) Aepinacodon americanus (16930)
Chadronian37.2 - 33.9USA (South Dakota) Aepinacodon americanus (type locality: 17006) Bothriodon americanus (16938)
Orellan33.9 - 33.3USA (South Dakota) Hyopotamus americanus (17141 17153)