|Basic info||Taxonomic history||Classification||Relationships|
|Morphology||Ecology and taphonomy||External Literature Search||Age range and collections|
Mammalia - Artiodactyla - Merycoidodontidae
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 1954||SKULL: Large size; basal length ranging from 306 to 320 mm., width from 153 to 220 mm.; dolichocephalic to submesocephalic; supraoccipital wings produced posteriorly beyond occipital condyles, not so widely spread as in examples of Promerycochoerus; exoccipital vacuities large, similar to exam- ples of Desmatochoerus; sagittal crest prominent; brain case long and narrow, not inflated to extent found in Promerycochoerus, similar to examples of Desmatochoerus; frontals moderately wide, comparable with examples of Desmatochoerus; nasals long and comparatively robust; anterior nasal-maxilla contact above P 1 ; orbits looking mostly outward; posterior portion of zygomatic arch light for size of skull, lighter than in examples of Promerycochoerus, posterior border not so high as in Promerycochoerus, more U-shaped in outline from lateral view than in Megoreodon (similar to examples of Desmatochoerus in this respect); malar very deep below the orbit in comparison with examples of Desmatochoerus; infraorbital foramen above P 3 to P 4 ; no facial vacuity; lacrimal fossa pronounced and deep; slight depression above the premolar region, not so deep or so extensive as in examples of Megoreodon (lacking prominent facial ridge above depression as present in Megoreodon); premaxillae joined for slightly longer distance than in Megoreodon; occipital condyles large, approaching size of those of Megoreodon; paroccipital process wide at base, compressed, with longitudinal axis approximately 45 degrees from long axis of skull; bulla inflated, laterally compressed, considerably less steep anterior slope to inferior border than in Megoreodon (bullae much more rounded in Promerycochoerus than in Superdesmatochoerus); post-glenoid process robust (more robust than in examples of Megoreodon), wide laterally.
MANDIBLE: Moderately robust; ramus deeper than in Megoreodon; inferior border of ramus slightly increasing in depth posteriorly, with a more pronounced downward curve posterior to M 3 ; ascending ramus high, higher than in examples of Megoreodon grandis; condyle moderately large, set approximately at right angle to dental series, with external border higher than internal; smaller than in Megoreodon grandis.
DENTITION: Slightly more brachyodont than in examples of Megoreodon; lighter than average examples of that genus; /C approximately twice the size of I 3 ; premolars decidedly smaller than those of Megoreodon; C/ and P1 large; diastema between P1 and P2, and frequently between P 2 and P 3 ; external styles of superior molars less prominent than in Megoreodon; suggestion of anterior intermediate crest on P 2 and P 3 ; posterior intermediate crest on p3.
LIMBS: (Fragments questionably associated with specimen Y.P.M. 10956, referred to Superdesmatochoerus microcephalus, indicate limb elements of smaller size than in Megoreodon; in the tentatively referred examples of S. lulli, the limb elements are slightly larger than in the last-mentioned genus.)