AP BIOLOGY

Detailed explanation-1: -Anthropoidea is a suborder of primates that includes humans, apes and monkeys. These mammals have a fused or bony mandibular symphysis, which is the place where the bones are closely joined. Species in the Strepsirrhini suborder – lemurs, for instance – have an unfused mandible.

Detailed explanation-2: -It has two surfaces and two borders. From the outside, the mandible is marked in the midline by a faint ridge, indicating the mandibular symphysis, the line of junction of the two halves of the mandible, which fuse at about one year of age.

Detailed explanation-3: -Their skulls, like those of other monkeys, have large and globular brain cases. The frontal bones fuse early in life. The two halves of the lower jaw are fused together and the body of the jaw is typically deep. The tendency for these monkeys to eat leaves is reflected in the deep lower jaw.