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In human anatomy, the facial skeleton of the skull the external surface of the mandible is marked in the median line by a faint ridge, indicating the mandibular symphysis (Latin: symphysis menti) or line of junction where the two lateral halves of the mandible typically fuse in the first year of life (6–9 months after birth). [1]
In contrast to extant anthropoids that express a fused mandibular symphysis, the mandibular symphysis of C. browni was observed to be unfused but covered in small rugose features in at least seven specimens. [6]
Strepsirrhines are also traditionally noted for their unfused mandibular symphysis (two halves of the lower jaw), [87] however, fusion of the mandibular symphysis was common in adapiforms, [92] notably Notharctus. [93] Also, several extinct giant lemurs exhibited a fused mandibular symphysis. [94]
The unfused mandibular symphysis and constricted roots of the lower postcanines support the placement of Alemoatherium within Prozostrodontia, a clade of cynodonts including mammaliaforms and many of their Late Triassic relatives, from Prozostrodon crownwards.
In CUP 2083, the mandibular symphysis is unfused, there is a single caniniform tooth in the dentary, and there is no groove along the symphysis. This contrasts with the holotype, which has a fused symphysis, at least two caniniform teeth, and a conspicuous trough along the symphysis. [3]
Azygonyx is placed in the suborder Tillodontia, an extinct group of mammals characterized by rodent-like incisors, clawed feet, and an elongated rostrum and mandibular symphysis. Azygonyx belongs to the family Esthonychidae, but differs from other esthonyids by having an unfused mandibular symphysis. [1]
The mandibular symphysis which connects the two halves of the mandibles in the middle of the lower jaw was unfused. The condyloid process, which connects the lower jaw to the skull, was located near the bottom of the mandible like other sperm whales. [1] [8]
The lower jaw is notably deeper at the back, with relatively shallow dentaries and an unfused mandibular symphysis (where the two lower jaws connect at the front) that is only weakly deflected downwards into a slight 'chin'. [1]