Although it retains primitive characters such as a small body size ( mean estimates range from ) and an unfused mandibular symphysis, it appears to be a primitive simian based on its dental characteristics, including a lower dental formula of 2-1-3-3.
32.
Some of the elements in " Megatherium "'s oral cavity were fused together : a rigidly articulated stylohyal and epihyal, and the apparatus lies farther anteriorly, which together with the elongated, steeply inclined mandibular symphysis, indicates a relatively shorter geniohyoid muscle and thus more limited capacity for tongue protrusion.
33.
Its last reported occurrence is from the middle Pliocene of Romania ( 2 to 4 million nasal aperture, a higher and narrower cranium, and a shorter mandibular symphysis than the other two species . " D . bozasi " appears at the beginning of the late Miocene, and continues there after the other two species have died out elsewhere.
34.
Its primitive features include an unfused mandibular symphysis, relatively large olfactory bulbs, small brain size, and large dentition compared to face and braincase . " C . browni " expresses notable derived anthropoidean and catarrhine traits including an anthropoidea-like auditory region, a reduction in the number of premolars per quadrant of both the maxilla and mandible, and the degree of observed postorbital closure.
35.
"Dalanistes " is similar to but 20 % larger than " Remingtonocetus "; the external nares are located more anteriorly ( above C 1 ); the sagittal crest is much higher; the rostrum is angled down 20?relative to the main axis of the braincase; the mandibular symphysis is relatively open ( ends at P 3 ) and the mandibular canals fail to unite at the symphysis.
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