A study done in 1987 linked Plesiadapiformes with adapids and omomyids through nine shared-derived features, six of which are cranial or dental : ( 1 ) auditory bulla inflated and formed by the petrosal bone, ( 2 ) ectotympanic expanded laterally and fused medially to the wall of the bulla, ( 3 ) promontorium centrally positioned in the bulla, and large hypotympanic sinus widely separating promontorium from the basisphenoid, ( 4 ) internal carotid entering the bulla posteriolaterally and enclosed in a bony tube, ( 5 ) nannopithex fold on the upper molars, and ( 6 ) loss of one pair of incisors.
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Its autapomorphies ( unique characteristics ) are the prossession of a sharp central ridge on the supraoccipital ( the bone above the occipital ), elongated frontal bones that are 2.86 times as long as they are wide, slender basipterygoid projections on the basisphenoid, a bone of the lower braincase, an atlas intercentrum that is horseshoe-shaped in cross-section, slender diapophyses, thin spines of the dorsal vertebrae and sacral vertebrae, the possession of a clear keel at the bottom of the sacral vertebrae, and an ilium with on the inner side a distinct ridge along the edge of the hip joint.
How to say basisphenoid in Hindi and what is the meaning of basisphenoid in Hindi? basisphenoid Hindi meaning, translation, pronunciation, synonyms and example sentences are provided by Hindlish.com.
