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|Morphology||Ecology and taphonomy||External Literature Search||Age range and collections|
Mammalia - Ungulata - 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 1949||SKULL:Moderately large to large; ranging in basal length from 221 to 325 mm.; in width from 183 to 265 mm.; dolichocephalic; supra- occipital wings moderately spread, protrud- ing posteriorly beyond the occipital condyles; sagittal crest moderately long and light; brain case expanded laterally; frontals usually wide; nasals with tendency to be somewhat retracted anteriorly; anterior nasal-maxilla contact above P 1 ; malar deep below orbit; zygomatic arch robust and extending upward to approximate level of the superior border of the sagittal crest; posterior border of the orbit and the posterior border of the zygo- matic arch forming a wide U-shaped opening (when viewed from side); superior, posterior border of the zygomatic arch straight and not hooked as in P. carrikeri but extending posteriorly beyond the postglenoid process; infraorbital foramen above region of PLM 1; lacrimal fossa small, but usually deep; depression above premolar region; premaxillae joined for short distance (similar to examples of Promerycochoerus); muzzle inflated later- ally and extended anteriorly; occipital con- dyles moderately robust; paroccipital process wide at base, tapering to lower border, and with axis more or less perpendicular to the length of the skull; bulla small but high, laterally compressed, approaching the type of bullae found in exam pies of M erycochoerus [bullae large and suboval in outline in Promerycochoerus, and extending below the level of the inferior border of the postglenoid process, while in P. (Parapromerycochoerus) bullae usually extending downward to about the level of the inferior border of the post- glenoid process]; postglenoid process heavy to robust, suboval in outline; posterior palate projecting farther posteriorly than in ex- amples of Promerycochoerus.
MANDIBLE:Light to moderately robust; postsymphysis below area of Pa; inferior bor- der gradually increasing in depth posteriorly to a point below the posterior lobe of Ma,then forming a downward curve; ascending ram us somewhat higher than in examples of Pro- merycochoerus and lacking the inferior inward curve of that genus; condyle large, similar to examples of Promerycochoerus.
DENTITION: Equal to examples of Promery- cochoerus but with a tendency towards being lighter; C/ and P1 large; PLP 8 with promi- nent anterior intermediate crest, in examples where wear allows observation.
LIMBS: Similar to examples of Promerycochoerus carrikeri.