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|Morphology||Ecology and taphonomy||External Literature Search||Age range and collections|
Mammalia - Artiodactyla - Merycoidodontidae
It was considered a nomen nudum by Cope (1884); it was considered a nomen dubium by Sinclair (1924); it was considered a nomen vanum by Lander (1998).
It was assigned to Agriochoeridae by Lambe (1908); to Merycoidodontidae by Leidy (1848), Thorpe (1937), Scott (1940), Galbreath (1953), Toohey (1959) and Stevens and Stevens (1996); and to Merycoidodontinae by Stevens and Stevens (2007).
|Year||Name and author|
|1884||Oreodon Cope p. 505|
|1887||Eucrotaphus (Oreodon) Scott and Osborn p. 155|
|1891||Oreodon Cope p. 21|
|1917||Oreodon Barbour and Cook|
|1940||Merycoidodon Scott p. 652 figs. Plates LXIX, LXX, LXXI, LXXIII|
|1949||Promesoreodon Schultz and Falkenbach p. 152 figs. 21-25|
|1954||Subdesmatochoerus Schultz and Falkenbach p. 217 figs. 18 - 21|
|1954||Prodesmatochoerus Schultz and Falkenbach p. 225 figs. 18, 22, 24 - 25|
|1968||Blickohyus Schultz and Falkenbach|
|1968||Genetochoerus Schultz and Falkenbach|
|1968||Otionohyus Schultz and Falkenbach|
|1968||Paramerycoidodon Schultz and Falkenbach|
|1996||Merycoidodon Stevens and Stevens|
|2007||Merycoidodon Stevens and Stevens p. 158|
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|C. B. Schultz and C. H. Falkenbach 1949 (Promesoreodon)||SKULL:Small, decidedly smaller than in any known species of Mesoreodon,ranging in basal length from 185 to 194 mm., in width from 112 to 132 mm.; low and wide; supraoc- cipital produced posteriorly; lateral wings not widely spread; exoccipital foramina pre- sent; sagittal crest light and high; brain case well inflated; frontals wide; nasals moder- ately robust; anterior nasal-maxilla contact above P1 ; malar moderately deep below the orbit; zygomatic arch light, with inward notch posterior of the orbit; infraorbital foramen above P 8 ; lacrimal fossa of moderate size, moderately deep (deeper than in examples of Mesoreodon);slight depression on side of face above PLP 2 ; muzzle robust; occipital con- dyles medium sized; paroccipital process wide at base; bulla well inflated and high; post- glenoid process from moderately robust to robust, peg-like in outline; posterior palate projecting slightly beyond M1•
MANDIBLE:Light; ramus increasing in depth rapidly posteriorly; inferior border of ramus straight with rapid downward curve below anterior of M1 ; ascending ramus high.
DENTITION: Lighter and more brachyodont than in Mesoreodon.
LIMBS: Short and light.
|C. B. Schultz and C. H. Falkenbach 1954 (Prodesmatochoerus)||SKULL: Medium size; basal length ranging from 155 to 184 mm., width from 80 to 100 mm.; dolichocephalic; supraoccipital high and narrow, lateral wings not widely spread, produced posteriorly beyond occipital condyles; exoccipital foramina small and oblong in outline (no vacuities in prominent pit as in Subdesmatochoerus); sagittal crest moderately high and light; brain case elongated; frontals narrow; nasals long and narrow, with pointed to rounded posterior border and with slight anterior retraction; anterior nasal- maxilla contact above C/; orbits rounded, moderately large, looking mostly outward; zygomatic arch with abrupt posterior rise; malar moderately deep below the orbit, deepest point below middle of orbit; infra- orbital foramen above anterior portion of P3 ; lacrimal fossa large and moderately deep; small facial depression in area above PLP 3 ; muzzle narrow; premaxillae touching but not definitely fused; occipital condyles of medium size, widely spaced; paroccipital process with excavated external surface; bulla very small (minute in contrast to those of Subdesmatochoerus); postglenoid process light, wide laterally, with moderately steep slope on external border; glenoid surface arched; posterior palate projecting posteriorly for slight distance beyond M3.
MANDIBLE: Medium size; ramus shallow; postsymphysis in region below P 8 ; inferior border with gradual downward curve below and posterior to M3; ascending ramus moderately high, robust posterior border; condyle light, set at less than right angle to axis of dentition, external border farther forward and slightly higher than internal border.
DENTITION: Brachyodont, approximately equal to examples of Subdesmatochoerus, definitely more brachyodont than in Desma- tochoerus; dental series shorter than in the latter genus, approximately equal to those of S. socialis, and long in relation to length of skull; inferior and superior premolars rather large, not crowded, set approximately parallel to alveolar border; external styles of superior molars moderately prominent; C/ and P1 varying in size from comparatively small to large (similar to those of Merychyus); PLP 8 each usually with weak anterior intermediate crest; P4 may or may not have an external anterior pit; Pa with weak posterior intermediate crest.
LIMBS: Moderate length; smaller and lighter than in Subdesmatochoerus.
|C. B. Schultz and C. H. Falkenbach 1954 (Subdesmatochoerus)||SKULL: Small to medium size; basal length ranging from 175 to 215 mm., width from 94 to 125 mm.; dolichocephalic to submesocephalic; supraoccipital wings not widely spread, produced posteriorly beyond the occipital condyles; exoccipital vacuities present; sagittal crest moderately high; brain case elongated; frontals narrow; nasals with noticeable tapering posteriorly, also anteriorly, slight anterior retraction; anterior nasal-maxilla contact above P 1 ; orbits slightly oval vertically, with long axis sloping upward anteroposteriorly; zygomatic arch with moderately abrupt rise posteriorly from below the orbit, with inward notch posterior to orbit; squamosal moderately light; malar moder- ately deep below the orbit; infraorbital foramen above pa; lacrimal fossa moderately large and deep; slight facial depression in area above P1 to midline of pa (anterior to infraorbital foramen); muzzle narrow; premaxillae touching, but not definitely fused; occipital condyles of medium size; paroccipital process wide at base, with noticeable external notch, triangular in outline at contact with bulla; bulla inflated, laterally compressed; postglenoid process robust, with tendency to be wide laterally as it is antero-posteriorly, steep slope to external border; posterior palate even with last lobe of M3 to slightly posterior of M 8.
MANDIBLE: Medium size; postsymphysis in region below P 2 and Pa; inferior border of ramus parallel to alveolar border, with gradual downward curve posterior to Ma; ascending ramus moderately high, posterior border robust; condyle set at less than right angle to axis of dentition, with external border of condyle farther forward and higher than internal border.
DENTITION: Brachyodont, more so than in examples of Desmatochoerus; series longer than examples of Prodesmatochoerus (with exception of those of P. socialis dakotensis) and shorter than in Desmatochoerus; C/ and P1moderately large; /C two to three times the size of Ia; premolars large, usually crowded, p1-p 2 and P2 set at slight angle to alveolar border; external styles of superior molars prominent; p1-ps each with anterior intermediate crest; P 8 with posterior intermediate crest.
LIMBS: Tendency to be slightly longer than examples of Prodesmatochoerus meekae; lighter and shorter than examples of Desmatochoerus and D. (Paradesmatochoerus).