Final answer:
Primates in the Holarctic continents belong to two groups: prosimians and anthropoids.
Step-by-step explanation:
Primates in the Holarctic continents belong to two groups: prosimians and anthropoids. Prosimians include the bush babies of Africa, the lemurs of Madagascar, and the lorises, pottos, and tarsiers of Southeast Asia. Anthropoids include monkeys, lesser apes, and great apes. The two groups of primates that are found on the Holarctic continents (which include North America, Europe, and parts of Asia) belong to the Strepsirrhini and Haplorhini. The Strepsirrhini, or wet-nosed primates, are largely nocturnal and include species such as bush babies, pottos, and lemurs. The Haplorhini, or dry-nosed primates, consist of tarsiers, simians (which include New World monkeys, Old World monkeys, apes, and humans), and generally exhibit diurnal behavior with a dependency on their vision. An interesting aspect is that strepsirrhines retain the enzymes to produce vitamin C, whereas haplorhines must derive it from their diet. Additionally, key characteristic features of all primates include pentadactyl fingers, diverse types of teeth, a distinct eye orbit architecture, and an opposable thumb.