PBDB Taxon

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

Eporeodon

Mammalia - Merycoidodontidae

Taxonomy

Eporeodon was named by Marsh (1875). Its type is Oreodon occidentalis.

It was synonymized subjectively with Eucrotaphus by Cope (1884).

It was assigned to Merycoidodontinae by Hay (1902); to Oreodontidae by Scott (1913); to Merycoidodontidae by Marsh (1875), Scott (1890), Thorpe (1921), Thorpe (1937), Scott (1940) and Lander (1998); and to Eporeodontinae by Schultz and Falkenbach (1968), Stevens and Stevens (1996), Stevens and Stevens (2007) and Stevens et al. (2023).

Species

E. (Oreodontoides), E. (Paraeporeodon), E. longifrons, E. occidentalis (syn. E. davisi, E. condoni, E. thurstoni, Dayohyus wortmani, Eucrotaphus trigonocephalus, E. leptacanthus), E. pacificus (syn. Eucrotaphus major longifrons, Hypsiops johndayensis, E. perbullatus, Pseudogenetochoerus covensis, E. leptacanthus leptacanthus, Eucrotaphus jacksoni leptacanthus)

Synonyms

Dayohyus was named by Schultz and Falkenbach (1968). Its type is Dayohyus wortmani.

It was synonymized subjectively with Eucrotaphus by Lander (1998); it was synonymized subjectively with Eporeodon by Stevens et al. (2023).

It was assigned to Eporeodontinae by Schultz and Falkenbach (1968).

Synonymy list

Year	Name and author
1875	Eporeodon Marsh
1890	Eporeodon Scott
1902	Eporeodon Hay p. 667
1913	Eporeodon Scott p. 361
1921	Eporeodon Thorpe
1937	Eporeodon Thorpe p. 62
1940	Eporeodon Scott p. 677 figs. Plat'e LXXII
1968	Dayohyus Schultz and Falkenbach
1968	Eporeodon Schultz and Falkenbach p. 198
1968	Dayohyus Schultz and Falkenbach p. 215 figs. Figures 28, 29, 52 (skulls, mandibles, and dentition), 30 (limbs)
1996	Eporeodon Stevens and Stevens p. 527
1998	Eporeodon Lander
2007	Eporeodon Stevens and Stevens p. 160
2023	Eporeodon Stevens et al. pp. 15- 17

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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	()

Rank	Name	Author
—	Mammaliamorpha
—	Mammaliaformes
class	Mammalia
—	Cladotheria
—	Zatheria
subclass	Tribosphenida	()
subclass	Theria
—	Eutheria	()
—	Placentalia
—	Boreoeutheria
—	Laurasiatheria
—	Scrotifera
—	Euungulata
—	Artiodactylamorpha
—	Artiodactyla	()
suborder	Tylopoda	()
family	Merycoidodontidae
subfamily	Eporeodontinae
genus	Eporeodon

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.

G. †Eporeodon Marsh 1875

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Subg. †Eporeodon (Oreodontoides) Thorpe 1921

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†Eporeodon (Oreodontoides) oregonensis Thorpe 1921

Subg. †Eporeodon (Paraeporeodon) Schultz and Falkenbach 1968

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†Eporeodon (Paraeporeodon) pacificus Cope 1884

†Eporeodon longifrons Cope 1884

†Eporeodon occidentalis Marsh 1873

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†Eporeodon trigonocephalus parvus Thorpe 1921

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 thurstoni Stock 1934 [synonym], Eucrotaphus trigonocephalus Cope 1884 [synonym]

†Eporeodon pacificus Cope 1884

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Invalid names: Eporeodon leptacanthus leptacanthus Cope 1884 [synonym], Eporeodon perbullatus Thorpe 1921 [synonym], Eucrotaphus major longifrons Cope 1884 [synonym], Hypsiops johndayensis Schultz and Falkenbach 1950 [synonym], Pseudogenetochoerus covensis Schultz and Falkenbach 1968 [synonym]

Invalid names: Dayohyus Schultz and Falkenbach 1968 [synonym], Eucrotaphus jacksoni leptacanthus Cope 1884 [synonym]

Diagnosis

Reference	Diagnosis
M. S. Stevens et al. 2023	Medium-sized oreodonts (basal length from171-207 mm; width of skull from 125-160 mm) with inflatedauditory bullae, small facial vacuities, tendency toward afan-shaped occiput, arched dorsal profile of the frontals andnasals, and mesodont teeth. Compared to Merycoidodon majorand other merycoidodontines with enlarged auditory bullae, Eporeodon has a much narrower and more concave nasal profile,more inclined premaxillae, and has a much larger and deeperpreorbital fossa.