Final answer:
The Order Primates is divided into prosimians and anthropoids, with lemurs being a member of prosimians, known for being nocturnal with smaller brains, and chimpanzees as a member of anthropoids, characterized by larger brains and complex social structures.
Step-by-step explanation:
The Order Primates is broadly categorized into two subgroups: prosimians and anthropoids. A member of the prosimian subgroup is the ring-tailed lemur. A unique aspect of prosimians is that they tend to be nocturnal and have relatively smaller brains in comparison to anthropoids. On the other hand, an example of an anthropoid is the chimpanzee, which belongs to the group of great apes. A distinctive feature of anthropoids is their larger brain size and the tendency towards more complex social structures compared to prosimians.