|Basic info||Taxonomic history||Classification||Relationships|
|Morphology||Ecology and taphonomy||External Literature Search||Age range and collections|
Merycoidodon (Otarohyus) major
Mammalia - Ungulata - Merycoidodontidae
It was recombined as Eporeodon major by Marsh (1875), Hay (1902), Thorpe (1921), Thorpe (1924), Thorpe (1937), Scott (1940) and Galbreath (1953); it was recombined as Eucrotaphus major by Cope (1884); it was recombined as Eucrotaphus (Oreodon) major by Scott and Osborn (1887); it was recombined as Paramerycoidodon (Barbourochoerus) major by Schultz and Falkenbach (1968); it was recombined as Mesoreodon major by Fremd (1994) and Lander (1998); it was recombined as Merycoidodon (Otarohyus) major by Stevens and Stevens (1996); it was recombined as Merycoidodon major by Stevens and Stevens (2007).
|Year||Name and author|
|1853||Oreodon major Leidy|
|1856||Oreodon major Leidy p. 164|
|1857||Oreodon major Leidy p. 89|
|1869||Oreodon hybridus Leidy|
|1873||Oreodon major Leidy p. 211|
|1873||Oreodon hybridus Leidy p. 212|
|1875||Eporeodon major Marsh p. 250|
|1884||Eucrotaphus major Cope p. 517|
|1887||Eucrotaphus (Oreodon) major Scott and Osborn p. 155|
|1902||Merycoidodon hybridus Hay p. 666|
|1902||Eporeodon major Hay p. 667|
|1921||Eporeodon major Thorpe|
|1924||Eporeodon hybridus Thorpe|
|1924||Eporeodon major Thorpe|
|1937||Eporeodon major Thorpe p. 74 figs. Fig. 7 ; PI. VI, figs. 1-3|
|1937||Eporeodon major hybridus Thorpe p. 77 figs. Fig. 38|
|1940||Eporeodon major Scott p. 679|
|1949||Promesoreodon scanloni Schultz and Falkenbach p. 152 figs. 21-25|
|1953||Eporeodon major Galbreath|
|1954||Pseudodesmatochoerus milleri Schultz and Falkenbach p. 209 figs. 12-15, 18|
|1954||Subdesmatochoerus shannonensis Schultz and Falkenbach p. 223 figs. 19 - 21|
|1968||Genetochoerus (Osbornohyus) chamberlaini Schultz and Falkenbach|
|1968||Otionohyus (Otarohyus) alexi Schultz and Falkenbach|
|1968||Paramerycoidodon (Barbourochoerus) major Schultz and Falkenbach p. 92 figs. igures 6-9, 1~23, 52|
|1968||Paramerycoidodon (Gregoryochoerus) wanlessi Schultz and Falkenbach p. 99 figs. Fgures 6-9, 19, 52|
|1968||Otionohyus (Otarohyus) hybridus Schultz and Falkenbach p. 129 figs. Figures 11-13, 19-23|
|1968||Otionohyus (Otarohyus) alexi Schultz and Falkenbach p. 132 figs. F:igures 11-13, 52|
|1968||Genetochoerus (Osbornohyus) chamberlaini Schultz and Falkenbach p. 152 figs. Fgures 14-16|
|1994||Mesoreodon major Fremd|
|1996||Merycoidodon (Otarohyus) major Stevens and Stevens p. 529 figs. Figures 2D, 3D; Tables 1-7; Appendix B|
|1998||Mesoreodon major Lander|
|2007||Merycoidodon major Stevens and Stevens p. 160|
Is something missing? Join the Paleobiology Database and enter the data
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.
|C. B. Schultz and C. H. Falkenbach 1949 (Promesoreodon scanloni)||SKULL: Small; see generic characters.
MANDIBLE: Light; see generic characters.
DENTITION:Brachyodont; series of less length than that in known species of Mesoreo- don; pa with anterior internal pits and P' with external anterior pit (not observable in well-worn specimens).
LIMBS: Short and light, equal to small examples of Merycoidodon culbertsonii.
|C. B. Schultz and C. H. Falkenbach 1954 (Pseudodesmatochoerus milleri)||SKULL: Medium size; tendency to be slightly smaller than examples of P. koffmani, larger than in P. longiceps; supraoccipital wings with less spread than in P. longiceps; sagittal crest with slightly depressed medial region, not so pronounced as in examples of P. koffmani; nasals long and light, with slight anterior retraction, less retraction than in latter species; anterior nasal-maxilla contact above P1, slightly more anterior than in examples of P. koffmani; infraorbital foramen above PLP 4; bulla of moderate size, smaller than other examples of genus; post-glenoid process more peg-shaped than in examples of P. kojfmani (closer to that of P. longiceps in this respect, but with less height).
MANDIBLE: Postsymphysis below anterior portion of Pa; posterior border of ascending ramus lighter than in P. longiceps. ·
DENTITION: Series approximately same size as examples of P. koffmani, larger than in P. longiceps, slightly longer than in P. wascoensis; more robust than in latter two species.
|C. B. Schultz and C. H. Falkenbach 1954 (Subdesmatochoerus shannonensis)||SKULL: Slightly larger than in S. socialis, smaller than that of holotype of S. montanus; exoccipital vacuities moderately large, smaller than those in S. montanus; zygomatic arch with less abrupt posterior rise and inward notch below posterior aspect of orbit more pronounced than in S. socialis; paroccipital process heavier at base than in that species; bulla similar to that in S. socialis except for less prominent external posterior groove and pit for hyoid attachment.
MANDIBLE: Slightly smaller than in holotype of S. montanus; larger than other forms of the genus.
DENTITION: Series with average length greater than that in S. socialis; anterior intermediate crests on PLP 3 each well de- veloped (a remnant of an analogous crest indicated in unworn C/).
LIMBS: Slightly larger and more robust than in S. socialis. (Known from fragmentary specimens only.)
|M. S. Stevens and J. B. Stevens 1996||The cranial characterization is the same as for the genus-subgenus, but the skull trends toward massiveness, with broad frontals and muzzle, widely spread zygomatic arches, well inflated auditory bullae which lack distinct hyoidal grooves, and small and generally pit-like preorbital fossae. The Subnasal L. averages 51.5% of the Nasal L. (13 specimens), the pl_P4;pLM3 averages 48.4% (Table 3), the APM3/ TM3 ratio averages 1.02 (Table 5), the mean APM3/Ht. M3 ratio is 1.68 (Table 4), and TM3/Ht. M3 averages 1.63 (Table 6).Merycoidodonmajor differs from Merycoidodon bullatus by a substantially (on the average , means of M . bullatus lie 1.7 SDs below those of Merycoidodon major; basis: SDs of M. major), and in terms of measurement means, systematically , larger size (significant for all measurement means except that of Nasal L.), a usually broader P.O.C., slightly but significantly more reduced premolars, and the cranial features noted above,otherwise similar. Merycoidodon major differs from Mesoreodon chelonyx by a system- atically smaller size (means average about 0.9 SDs of M . major smaller; signific ant: pl-M3, pl_P4 , MI -M3, APM3s, Ht. M3, and Nasal L.), significantly less anteroposteriorly attenuated M3s, and slightly lower crowned teeth , otherwise very similar.|
|Source: f = family, o = order, c = class, subp = subphylum|
|References: Nowak 1999, Lander 1998, Carroll 1988, Hendy et al. 2009|
Collections (30 total)
|Time interval||Ma||Country or state||Original ID and collection number|
|Orellan||USA (Nebraska)||Genetochoerus norbeckensis (17222)|
|Orellan||USA (North Dakota)||Genetochoerus norbeckensis (17101)|
|Whitneyan||USA (Wyoming)||Merycoidodon major (17383)|
|Whitneyan||USA (Colorado)||Eporeodon major (17426)|
|Whitneyan||USA (South Dakota)||Eporeodon major (17343) Genetochoerus chamberlaini (17348) Merycoidodon lynchi (17355) Paramerycoidodon major (17317 17324 17339 17340 17353 17370 17378 17380 17387 17431) Paramerycoidodon wanlessi (17360 17364)|
|Whitneyan||USA (Nebraska)||Genetochoerus chamberlaini (17401 17435) Merycoidodon lynchi (17409 17418) Otionohyus alexi (17417) Paramerycoidodon major (17419 17421) Paramerycoidodon wanlessi (17408) Subdesmatochoerus shannonensis (17376)|
|Arikareean||USA (Wyoming)||Pseudodesmatochoerus milleri (17524 17532)|