Final answer:
The two suborders of haplorhines are Simiiformes, including Platyrrhini (New World monkeys) and Catarrhini (Old World monkeys, apes, and humans). Simiiformes are known for their prehensile tails, while Catarrhini are recognized by their downward-facing nostrils and include the tailless apes and humans.
Step-by-step explanation:
The two suborders of haplorhines are Simiiformes and Tarsiiformes. The Simiiformes suborder is further divided into two infraorders: Platyrrhini and Catarrhini. Platyrrhines, also known as New World monkeys, are found in Central and South America and are renowned for their prehensile tails, which act almost like an extra limb while moving in trees. Some examples of platyrrhines include marmosets, tamarins, howler monkeys, and capuchins.
In contrast, the Catarrhini infraorder, also known as Old World monkeys, have downward-facing, narrow nostrils and are native to the continents of Africa and Asia. This group is further classified into two superfamilies: Cercopithecoidea and Hominoidea. Cercopithecoidea includes cheek pouch monkeys (Cercopithecinae) like baboons and macaques, as well as leaf-eating monkeys (Colobinae) such as colobus and langurs. The Hominoidea superfamily consists of apes and humans which lack tails and include gibbons, chimpanzees, gorillas, orangutans, and humans.