Basic info Taxonomic history Classification Included Taxa
Morphology Ecology and taphonomy External Literature Search Age range and collections

Eporeodon occidentalis

Mammalia - Merycoidodontidae

Taxonomy
Oreodon occidentalis was named by Marsh (1873). Its type specimen is YPM 10142, a partial skull, and it is a 3D body fossil. It is the type species of Eporeodon.

It was recombined as Eucrotaphus occidentalis by Cope (1879); it was synonymized subjectively with Eucrotaphus jacksoni by Cope (1884); it was recombined as Merycochoerus occidentalis by Fremd (1994); it was recombined as Eporeodon occidentalis by Marsh (1875), Marsh (1884), Hay (1902), Douglass (1906), Thorpe (1921), Thorpe (1924), Thorpe (1937), Schultz and Falkenbach (1968), Lander (1998), Stevens and Stevens (2007) and Stevens et al. (2023).

Synonyms
Synonymy list
YearName and author
1873Oreodon occidentalis Marsh p. 409
1875Eporeodon occidentalis Marsh p. 250
1879Eucrotaphus occidentalis Cope
1884Eucrotaphus trigonocephalus Cope p. 514
1884Eporeodon occidentalis Marsh
1896Eporeodon trigonocephalus Roger
1902Eporeodon occidentalis Hay p. 667
1902Eporeodon trigonocephalus Hay p. 667
1906Eporeodon occidentalis Douglass p. 566
1921Eporeodon occidentalis Thorpe
1921Eporeodon trigonocephalus Thorpe p. 101
1921Eporeodon condoni Thorpe p. 104 figs. 6 - 8
1924Eporeodon occidentalis Thorpe
1934Eporeodon thurstoni Stock
1937Eporeodon condoni Thorpe p. 66 figs. Figs. 31-33
1937Eporeodon occidentalis Thorpe p. 82 figs. Figs. 41-43
1937Eporeodon thurstoni Thorpe p. 96 figs. PI. XLIII, fig. 1
1937Eporeodon trigonocephalus Thorpe p. 96 figs. PI. VIII, figs. 4-6
1954Desmatochoerus (Paradesmatochoerus) thurstoni Schultz and Falkenbach p. 202
1960Eporeodon thurstoni Stirton p. 363
1968Dayohyus trigonocephalus Schultz and Falkenbach
1968Dayohyus wortmani Schultz and Falkenbach
1968Eporeodon davisi Schultz and Falkenbach
1968Pseudogenetochoerus condoni Schultz and Falkenbach
1968Eporeodon occidentalis Schultz and Falkenbach p. 201 figs. Figures 24, 30, 52
1968Eporeodon davisi Schultz and Falkenbach p. 203 figs. Figures 24, 30, 52
1968Dayohyus wortmani Schultz and Falkenbach p. 217 figs. Figures 28-30, 52.
1989Desmatochoerus thurstoni Mason and Swisher
1994Eucrotaphus trigonocephalus Fremd
1994Merycochoerus occidentalis Fremd
1998Eporeodon occidentalis Lander
1998Eucrotaphus trigonocephalus Lander
2007Eporeodon occidentalis Stevens and Stevens p. 160
2007Eporeodon thurstoni Stevens and Stevens p. 160
2007Eporeodon trigonocephalus Stevens and Stevens p. 164
2023Eporeodon occidentalis Stevens et al. p. 18 figs. Figures 2, 10-14; Tables A1, A2

Is something missing? Join the Paleobiology Database and enter the data

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()
familyMerycoidodontidae
subfamilyEporeodontinae
genusEporeodon
speciesoccidentalis()

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.

Eporeodon occidentalis Marsh 1873
show all | hide all
Invalid names: Dayohyus wortmani Schultz and Falkenbach 1968 [synonym], Eporeodon condoni Thorpe 1921 [synonym], Eporeodon davisi Schultz and Falkenbach 1968 [synonym], Eporeodon leptacanthus Cope 1884 [synonym], Eporeodon longifrons Cope 1884 [synonym], Eporeodon thurstoni Stock 1934 [synonym], Eucrotaphus trigonocephalus Cope 1884 [synonym]
Diagnosis
ReferenceDiagnosis
M. R. Thorpe 1937 (Eporeodon thurstoni)This species approaches E. socialis in size but is somewhat smaller. There is an antorbital pit, and the bulla; are large. The orbit is decidedly large. The skull lacks the greater portion of the cranium, so that it is unwise to diagnose the skull characters until more comparable material is brought to light.
Skeleton: Stock records the fact that the right pes has a rudimentary element articulated with the navicular and situated above the proximal end of Mt. II. He infers that it may represent a fused entocuneiform and rudimentary Mt. I. Its posterodistal end is rounded.
C. B. Schultz and C. H. Falkenbach 1954 (Desmatochoerus (Paradesmatochoerus) thurstoni)SKULL: Smaller than skulls of D. (P.) sanfordi and Merycoides cursor; prelacrimal fossa present; bulla large.
MANDIBLE: (See discussion below).
DENTITION: Superior series estimated to be shorter than examples of D. (P.) sanfordi, slightly longer than those of M. cursor.
LIMBS:Resembling examples of Subdesmatochoerus socialis.
M. S. Stevens et al. 2023Smallest species of Eporeodon (M1-3 length =35-45 mm), with a relatively small auditory bulla, and a less fan-shaped occipital crest.