PBDB Taxon

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Eporeodon (Paraeporeodon) pacificus

Mammalia - Merycoidodontidae

Taxonomy

Eucrotaphus jacksoni pacificus was named by Cope (1884) [named as a subspecies of E. jacksoni by Cope 1884; raised to species level]. Its type specimen is AMNH 7502, a skull, and it is a 3D body fossil.

It was recombined as Eucrotaphus pacificus by Trouessart (1898); it was recombined as Eporeodon occidentalis pacificus by Matthew (1899); it was recombined as Eporeodon leptacanthus pacificus by Thorpe (1921); it was recombined as Eporeodon (Paraeporeodon) pacificus by Schultz and Falkenbach (1968); it was synonymized subjectively with Merycochoerus occidentalis by Fremd (1994); it was synonymized subjectively with Eporeodon occidentalis by Lander (1998); it was recombined as Eporeodon pacificus by Hay (1902), Thorpe (1937), Stevens and Stevens (2007) and Stevens et al. (2023).

Synonyms

Eucrotaphus major longifrons was named by Cope (1884) [named as a subspecies of Eucrotaphus major by Cope 1884; raised to species level; made type of subgenus Paraeporeodon by Schultz & Falkenbach 1968]. Its type specimen is AMNH 7504, a partial skull, and it is a 3D body fossil.

It was recombined as Eporeodon longifrons by Hay (1902), Thorpe (1921) and Thorpe (1937); it was recombined as Eporeodon (Paraeporeodon) longifrons by Schultz and Falkenbach (1968); it was synonymized subjectively with Eporeodon occidentalis by Lander (1998); it was synonymized subjectively with Eporeodon pacificus by Stevens et al. (2023).
Eucrotaphus jacksoni leptacanthus was named by Cope (1884) [named as a subspecies of Eucrotaphus jacksoni by Cope 1884; raised to species level].

It was recombined as Eporeodon leptacanthus by Matthew (1909), Thorpe (1921) and Thorpe (1937); it was recombined as Eporeodon (Paraeporeodon) leptacanthus by Schultz and Falkenbach (1968); it was synonymized subjectively with Merycochoerus occidentalis by Fremd (1994); it was synonymized subjectively with Eporeodon occidentalis by Lander (1998); it was synonymized subjectively with Eporeodon pacificus by Stevens et al. (2023).
Eporeodon perbullatus was named by Thorpe (1921). Its type specimen is YPM 11011 and is a 3D body fossil.

It was synonymized subjectively with Eporeodon longifrons by Thorpe (1937); it was recombined as Eporeodon (Paraeporeodon) longifrons perbullatus by Schultz and Falkenbach (1968); it was synonymized subjectively with Eporeodon occidentalis by Lander (1998); it was synonymized subjectively with Eporeodon pacificus by Stevens et al. (2023).
Eporeodon leptacanthus leptacanthus was named by Cope (1884).

It was synonymized subjectively with Eporeodon pacificus by Stevens et al. (2023).
Hypsiops johndayensis was named by Schultz and Falkenbach (1950). Its type specimen is CIT 3503, a partial skeleton (Skull with I1(alv.)-M3, partial left ramus with p3-m3, and atlas), and it is a 3D body fossil.

It was synonymized subjectively with Hypsiops breviceps by Lander (1998); it was synonymized subjectively with Eporeodon pacificus by Stevens et al. (2023).
Pseudogenetochoerus covensis was named by Schultz and Falkenbach (1968) [genotype]. Its type locality is The Cove, which is in a Miocene/Miocene terrestrial horizon in the John Day Formation of Oregon.

It was synonymized subjectively with Eucrotaphus trigonocephalus by Fremd (1994) and Lander (1998); it was synonymized subjectively with Eporeodon pacificus by Stevens et al. (2023).

Synonymy list

Year	Name and author
1884	Eporeodon leptacanthus leptacanthus Cope
1884	Eucrotaphus jacksoni pacificus Cope p. 33
1884	Eucrotaphus jacksoni leptacanthus Cope p. 519
1884	Eucrotaphus major longifrons Cope p. 520
1898	Eucrotaphus pacificus Trouessart
1899	Eporeodon occidentalis pacificus Matthew p. 64
1902	Eporeodon longifrons Hay p. 667
1902	Eporeodon pacificus Hay p. 667
1909	Eporeodon leptacanthus Matthew
1921	Eporeodon leptacanthus pacificus Thorpe p. 99
1921	Eporeodon leptacanthus Thorpe p. 101
1921	Eporeodon longifrons Thorpe p. 103
1921	Eporeodon perbullatus Thorpe p. 106
1937	Eporeodon leptacanthus Thorpe p. 70 figs. PI. Ill, figs. 6-8
1937	Eporeodon longifrons Thorpe p. 71 figs. PI. V, figs. 1-3
1937	Eporeodon pacificus Thorpe p. 83 figs. PI. VIII, figs. 1-3
1950	Hypsiops johndayensis Schultz and Falkenbach p. 123 figs. 4-6, 12
1968	Pseudogenetochoerus covensis Schultz and Falkenbach
1968	Eporeodon (Paraeporeodon) pacificus Schultz and Falkenbach p. 205 figs. gures 25-27,30, 52.
1968	Eporeodon (Paraeporeodon) longifrons Schultz and Falkenbach p. 207 figs. Figures 25-27, 30, 52
1968	Eporeodon (Paraeporeodon) longifrons perbullatus Schultz and Falkenbach p. 210 figs. Figures 25-27, 30
1968	Eporeodon (Paraeporeodon) leptacanthus Schultz and Falkenbach p. 213 figs. Figures 25-27, 30
2007	Eporeodon pacificus Stevens and Stevens p. 160
2023	Eporeodon pacificus Stevens et al. p. 21 figs. Figures 15-18; Appendix 1A; Table A3

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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	()
—	Mammaliamorpha
—	Mammaliaformes

Rank	Name	Author
class	Mammalia
—	Theriamorpha	(Rowe 1993)
—	Theriiformes	()
—	Trechnotheria
—	Cladotheria
—	Zatheria
subclass	Tribosphenida	()
subclass	Theria
—	Eutheria	()
—	Placentalia
—	Boreoeutheria
—	Laurasiatheria
—	Scrotifera
—	Euungulata
—	Artiodactylamorpha
—	Artiodactyla	()
family	Merycoidodontidae
subfamily	Eporeodontinae
genus	Eporeodon
subgenus	Paraeporeodon
species	pacificus	()

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 (Paraeporeodon) pacificus Cope 1884

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Diagnosis

Reference	Diagnosis
M. S. Stevens et al. 2023	Largest species of Eporeodon (M1-3 length =43-55 mm), with more robust skulls, slightly larger auditory bullae, and a slightly more fan-shaped occipital crest.