A Bilateral Division of the Parietal Bone in a Chimpanzee; with a Special Reference to the Oblique Sutures in the Parietal

A meticulous case study describes an unusual bilateral division of the parietal bones in a chimpanzee skull, documenting the exact courses, overlaps, and serration of the anomalous sutures alongside detailed cranial measurements and suture patency. The author compares these oblique divisions with previously reported parietal sutures in other apes, notes associated bends in the coronal suture and overall cranial symmetry, and records dental and vault features. Precise anatomical observations are used to consider developmental interpretations of the divisions, treating them as segmental variants of parietal formation rather than signs of traumatic or pathological alteration.