|Basic info||Taxonomic history||Classification||Relationships|
|Morphology||Ecology and taphonomy||External Literature Search||Age range and collections|
Mammalia - Ungulata - Merycoidodontidae
|C. B. Schultz and C. H. Falkenbach 1949||SKULL: Large, basal length ranging from 221 to 350 mm. and width from 149 to 276 mm.; supraoccipital region protruding pos- teriorly beyond the occipital condyles, with
lateral wings small and moderately flared outward; sagittal crest narrow and high, but not so long as in examples of Promeryco- choerus; brain case inflated, rounded, and slightly elongated; frontals wide; nasals large, moderately robust, with slightly rounded anterior superior surface, but not to the de- gree found in average examples of Promery-
cochoerus,and with slight anterior retraction; nasal-maxilla contact above anterior portion of P 1 to anterior portion of P 2 ; malar deep below orbit; zygomatic arch, especially pos- terior portion, light in comparison with examples of Promerycochoerus,· zygomatic arch with gradual rise posteriorly from below orbit and not extending downward or posteriorly so far as in examples of Promerycochoerus; posterior tip of arch approximately above the postglenoid process (in Promerycochoerus the zygomatic arch usually extending for some distance posterior to the postglenoid process, thus forming a definite narrow U-shape from side view); lacrimal fossa approximately equal to that in Promerycochoerus; infraor- bital foramen above region of P'; facial de- pression above the premolar region; premax- illae joined for short distance; muzzle with outward flare (resulting from constriction in facial region); posterior palate projecting for considerable distance beyond M1, somewhat
more than in examples of Promerycochoerus; occipital condyles moderately robust; paroc- cipital process moderately wide at base and set at slight angle to longitudinal axis of skull; bulla well inflated and usually oblong in outline; postglenoid process robust, similar to that in average examples of Promeryco- choerus.
MANDIBLE:Approximately equal to ex- amples of Promerycochoerus; postsymphysis in the area below Pa; ramus shallow; inferior border of ramus with rather sharp downward curve below second lobe of Ma: ascending ramus similar to examples of Promeryco- choerus,with posterior border almost straight, lacking inward curve of examples of Promery- cochoerus; condyle moderately heavy, similar to examples of Promerycochoerus.
DENTITION:Brachyodont; premolars not crowded as in examples of Promerycochoerus, otherwise quite similar to examples of that genus.
LIMBS: Approximately equal in size or larger than those of examples of Promerycochoerus, but with a tendency towards being somewhat lighter.