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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: Large (slightly larger than examples of Merycochoerus); basal length ranging from 266 to 350 mm.; width, from 190 to 322 mm.; brachycephalic; supraoccipital region narrow, produced posteriorly beyond occipital condyles with lateral wings moder- ately spread (in contrast to the fan-shaped occipital region of Merycochoerus);brain case inflated, comparatively small for size of skull; frontals wide, but with considerable individual variation; nasals long, with su- perior surface rounded and tendency towards slight anterior retraction; orbit rounded; malar deep below the orbit; zygomatic arch robust (lighter in supposed female examples); inferior border of arch curving downward from malar, then upward almost to the level of the sagittal crest, with tendency to extend posteriorly beyond the area above the post-
glenoid process; lacrimal fossa moderately small and shallow; infraorbital foramen above region of PLP'; facial area depressed above the premolars; muzzle laterally expanded; premaxillae fused for short distance; occipital condyles moderately heavy; paroccipital proc- ess wide at base with lateral twist forward and with axis at angle to skull; bulla large, inflated, and round to oval in outline; post- glenoid process blocky, and extended later- ally; posterior palate projecting for slight distance beyond M1•
MANDIBLEM:oderatelyrobustbutnotto degree noted in Merycochoerus;postsymphy- sis below region of PrP,; ramus shallow; ascending ramus long anteroposteriorly and comparatively shallow; condyle moderately large, placed at slight inward angle; inferior border of ramus usually parallel to alveolar border to a point below the posterior lobe of Ma,from which it curves downward sharply; posterior border of ascending ramus with a prominent inward curve at base.
DENTITION:Brachyodont; heavy; large, massive C/ and P1; premolars slightly crowded but with tendency for a small diastema between P 1 and P 2 ; prominent anterior intermediate crest on P2 and pa (often obscured by wear) ; weak posterior intermediate crest on P 8 ; anterior and pos-
terior portions of P, separated by a high point or cusp.
LIMBS:Moderately robust; more massive and somewhat longer than examples of Merycochoerus matthewi from the lower Marsland formation.