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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 1950||SKULL: Large size; high; frontals wide; nasals moderately heavy with slight lateral curve to superior surface, greatly retracted anteriorly (more so than in Hypsiops and Promerycochoerus, but not to extent found in examples of Merycochoerus or Brachycrus); anterior nasal-maxilla contact above P4 [in Hypsiops above P1 and P2, in P. (Parapromerycochoerus) macrostegus above P 1, and in
M. matthewi above M1]; orbit oval vertically, with long axis sloping upward anteroposte- riorly, looking chiefly outward; zygomatic arch moderately heavy, squamosal U-shaped in outline; malar moderately deep below orbit, with a prominent angular protuberance present on anterior, inferior border, similar to that found in examples of Hypsiops and Merycochoerus; infraorbital foramen above anterior portion of P 4 ; lacrimal fossa large and deep; small facial vacuity just anterior to and above the lacrimal fossa; muzzle broad, similar to that of Hypsiops and Merycochoerus, not protruding beyond the side of the face as in examples of Promerycochoerus; premaxillae joined for about same distance as in Hypsiops, for longer distance than in examples of Promerycochoerus, but less than in Merycochoerus; postglenoid process moderately robust, wide transversely, with steeply sloping internal and external borders; posterior palate noticeably projecting beyond Ms, comparable with examples of Hypsiops, but not to the extent found in Merycochoerus. (Sagittal crest and occipital region including bulla unknown.)
MANDIBLE: Moderately heavy; postsymphysis below posterior portion of Pa; ramus increasing in depth posteriorly, inferior border with a slight downward curve below and posterior to Ms, similar to examples of Hypsiops; ascending ramus high, similar to examples of H. brachymelis, but higher than in examples of Promerycochoerus or Merycochoerus;condyle wide transversely, set at less than right angle to axis of dental series with external border of condyle noticeably farther forward than internal border.
DENTITION: Series slightly heavier than in Hypsiops, lighter than in average examples of Promerycochoerus and Merycochoerus; less crowding of the premolars than in Merycochoerus, more like examples of Hypsiops and Promerycochoerus; P 2 with anterior intermediate crest, somewhat stronger on P3.
LIMBS: Robust, slightly longer and heavier than examples of H. brachymelis, definitely lighter and shorter than in examples of Promerycochoerus and Merycochoerus.