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Promerycochoerus

Mammalia - Merycoidodontidae

Synonymy list
YearName and author
1901Promerycochoerus Douglass
1913Promerycochoerus Scott p. 361
1937Promerycochoerus Thorpe p. 104
1949Promerycochoerus Schultz and Falkenbach p. 84
2007Promerycochoerus Stevens and Stevens p. 160
2023Promerycochoerus Stevens et al. p. 62

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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()
Mammaliamorpha
RankNameAuthor
Mammaliaformes
classMammalia
Theriamorpha(Rowe 1993)
Theriiformes()
Trechnotheria
Cladotheria
Zatheria
subclassTribosphenida()
subclassTheria
Eutheria()
Placentalia
Boreoeutheria
Laurasiatheria
Scrotifera
Euungulata
Artiodactylamorpha
Artiodactyla()
familyMerycoidodontidae
subfamilyPromerycochoerinae
genusPromerycochoerus

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. †Promerycochoerus Douglass 1901
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Subg. †Promerycochoerus (Parapromerycochoerus) Schultz and Falkenbach 1949
Subg. †Promerycochoerus (Pseudopromerycochoerus) Schultz and Falkenbach 1949
Promerycochoerus carrikeri Peterson 1907
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Invalid names: Promerycochoerus (Parapromerycochoerus) barbouri Schultz and Falkenbach 1949 [synonym], Promerycochoerus gregoryi Loomis 1924 [synonym], Promerycochoerus thomsoni Loomis 1924 [synonym], Promerycochoerus vantasselensis Peterson 1907 [synonym]
Promerycochoerus leidyi Bettany 1876
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Invalid names: Merycochoerus macrostegus Cope 1884 [synonym], Merycochoerus montanus Cope 1884 [synonym], Merycochoerus temporalis Bettany 1876 [synonym], Promerycochoerus (Pseudopromerycochoerus) montanus pinensis Schultz and Falkenbach 1949 [synonym], Promerycochoerus inflatus Thorpe 1921 [synonym], Promerycochoerus latidens Thorpe 1921 [synonym], Promerycochoerus microcephalus Thorpe 1921 [synonym]
Diagnosis
ReferenceDiagnosis
C. B. Schultz and C. H. Falkenbach 1949SKULL: Large (slightly larger than examples of Merycochoerus); basal length ranging from 266 to 350 mm.; width, from 190 to 322 mm.; brachycephalic; supraoccipital region narrow, produced posteriorly beyond occipital condyles with lateral wings moder- ately spread (in contrast to the fan-shaped occipital region of Merycochoerus);brain case inflated, comparatively small for size of skull; frontals wide, but with considerable individual variation; nasals long, with su- perior surface rounded and tendency towards slight anterior retraction; orbit rounded; malar deep below the orbit; zygomatic arch robust (lighter in supposed female examples); inferior border of arch curving downward from malar, then upward almost to the level of the sagittal crest, with tendency to extend posteriorly beyond the area above the post-
glenoid process; lacrimal fossa moderately small and shallow; infraorbital foramen above region of PLP'; facial area depressed above the premolars; muzzle laterally expanded; premaxillae fused for short distance; occipital condyles moderately heavy; paroccipital proc- ess wide at base with lateral twist forward and with axis at angle to skull; bulla large, inflated, and round to oval in outline; post- glenoid process blocky, and extended later- ally; posterior palate projecting for slight distance beyond M1•
MANDIBLEM:oderatelyrobustbutnotto degree noted in Merycochoerus;postsymphy- sis below region of PrP,; ramus shallow; ascending ramus long anteroposteriorly and comparatively shallow; condyle moderately large, placed at slight inward angle; inferior border of ramus usually parallel to alveolar border to a point below the posterior lobe of Ma,from which it curves downward sharply; posterior border of ascending ramus with a prominent inward curve at base.
DENTITION:Brachyodont; heavy; large, massive C/ and P1; premolars slightly crowded but with tendency for a small diastema between P 1 and P 2 ; prominent anterior intermediate crest on P2 and pa (often obscured by wear) ; weak posterior intermediate crest on P 8 ; anterior and pos-
terior portions of P, separated by a high point or cusp.
LIMBS:Moderately robust; more massive and somewhat longer than examples of Merycochoerus matthewi from the lower Marsland formation.
M. S. Stevens et al. 2023Largest genus of the Promerycochoerinae, with distinctly flaring zygomatic arches, and the posterodorsal part of each zygomatic arch has an upwardly curved ridge.
Measurements
No measurements are available
Composition: phosphaticsubp
Environment: terrestrialo
Locomotion: actively mobilec
Life habit: ground dwellingf
Diet: herbivoref
Reproduction: viviparoussubc
Created: 2005-08-31 14:37:21
Modified: 2005-08-31 16:37:21
Source: f = family, o = order, subc = subclass, c = class, subp = subphylum
References: Carroll 1988, Nowak 1999, Lander 1998, Lillegraven 1979, Hendy et al. 2009

Age range: base of the Monroecreekian to the top of the Harrisonian or 26.30000 to 20.43000 Ma

Collections (35 total)


Time interval Ma Country or state Original ID and collection number
Arikareean30.8 - 20.43USA (Oregon) Eucrotaphus superbus, Merycochoerus leidyi, Merycochoerus temporalis (180202) Merycochoerus superbus (93080)
Arikareean30.8 - 20.43USA (Wyoming) Desmatochoerus hatcheri (17727) P. leidyi (17696)
Arikareean30.8 - 20.43USA (South Dakota) P. carrikeri, P. montanus (17448) P. montanus (17447 17452 17688) P. montanus, P. thomsoni (17690)
Arikareean30.8 - 20.43USA (Montana) P. latidens (17722) P. montanus (17478)
Chattian28.1 - 23.03USA (Oregon) Merycochoerus superbus (17603) Merycochoerus superbus, P. macrostegus (93079)
Monroecreekian26.3 - 24.8USA (South Dakota) P. montanus (17547)
Monroecreekian26.3 - 24.8USA (Nebraska) P. carrikeri (17565)
Monroecreekian26.3 - 24.8USA (Washington) P. superbus (119840 119841)
Monroecreekian - Harrisonian26.3 - 20.43USA (Oregon) Merycochoerus superbus, P. macrostegus (17528)
Harrisonian24.8 - 20.43USA (Wyoming) P. barbouri, P. carrikeri (17794 17801 17815) P. carrikeri (17812 17813 17821) P. vantasselensis (17853)
Harrisonian24.8 - 20.43USA (Nebraska) P. carrikeri (17808 17834)
Harrisonian24.8 - 20.43USA (Montana) P. barbouri (17761)
Harrisonian24.8 - 20.43USA (South Dakota) P. barbouri, P. carrikeri, P. montanus (17451) P. barbouri, P. carrikeri, P. montanus, Desmatochoerus curvidens (17455) P. montanus (17444 17449) P. pinensis (17506) P. thompsoni (17743)
Early/Lower Miocene23.03 - 15.97USA (Oregon) Desmatochoerus leidyi, Superdesmatochoerus microcephalus (157001)