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Hyracodon leidyanus

Osteichthyes - Perissodactyla - Hyracodontidae

Taxonomy
Hyracodon leidyanus was named by Troxell (1921). Its type specimen is YPM 11168, a partial skull (a maxillary and ramus with tooth series P1 to M2 and p2 to m1, inclusive.), and it is a 3D body fossil. Its type locality is Crow Buttes (Whitney-South Dakota), which is in a Whitneyan terrestrial horizon in South Dakota.

It was synonymized subjectively with Hyracodon nebraskensis by Scott (1941), Galbreath (1953).

Synonyms
Synonymy list
YearName and author
1921Hyracodon leidyanus Troxell p. 38 figs. 4, 5
1922Hyracodon apertus Sinclair
1926Hyracodon apertus Wood p. 317
1926Hyracodon leidyanus Wood p. 317
1996Hyracodon leidyanus Prothero
1998Hyracodon leidyanus Prothero p. 591

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RankNameAuthor
kingdomAnimalia()
—Bilateria
—EubilateriaAx 1987
—Deuterostomia
phylumChordataHaeckel 1874
subphylumVertebrata
superclassGnathostomata
classOsteichthyes
subclassSarcopterygii()
subclassDipnotetrapodomorpha(Nelson 2006)
subclassTetrapodomorpha()
—Tetrapoda
—Reptiliomorpha
—Anthracosauria
subclassAmphibiosauriaKuhn 1967
—Cotylosauria()
—Amniota
subclassSynapsida
—Therapsida()
infraorderCynodontia()
—Mammaliamorpha
RankNameAuthor
—Mammaliaformes
classMammalia
—Cladotheria
—Zatheria
subclassTribosphenida()
subclassTheria
—Eutheria()
—Placentalia
—Boreoeutheria
—Laurasiatheria
—Scrotifera
—Euungulata
—Panperissodactyla
superorderPerissodactylamorpha
orderPerissodactyla()
—Tapiromorpha(Haeckel 1873)
—Ceratomorpha(Wood 1937)
superfamilyRhinocerotoidea
familyHyracodontidaeCope 1879
genusHyracodon
speciesleidyanus

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.

†Hyracodon leidyanus Troxell 1921
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Invalid names: Hyracodon apertus Sinclair 1922 [synonym]
Diagnosis
No diagnoses are available
Measurements
No measurements are available
Composition: phosphaticsubp
Environment: terrestrialsubc
Locomotion: actively mobilec
Life habit: ground dwellingf
Diet: browserf
Reproduction: viviparoussubc
Created: 2005-08-31 15:07:17
Modified: 2005-08-31 17:07:17
Source: f = family, subc = subclass, c = class, subp = subphylum
References: Lillegraven 1979, Ji et al. 2002, Hendy et al. 2009, Prothero 1998, Carroll 1988

Age range: Whitneyan or 31.80000 to 29.50000 Ma

Collections (7 total)


Time interval Ma Country or state Original ID and collection number
Whitneyan31.8 - 29.5USA (South Dakota) Hyracodon leidyanus (type locality: 17326 17344) Hyracodon nebraskensis (17336 17337 17338)
Whitneyan31.8 - 29.5USA (Nebraska) Hyracodon leidyanus (17369)
Whitneyan31.8 - 29.5USA (Colorado) Hyracodon sp. (17426)