Final answer:
The two infraorders of the anthropoid suborder are Simiiformes, which includes New World monkeys (Platyrrhini) and Old World monkeys, apes, and humans (Catarrhini), and Tarsiiformes.
Step-by-step explanation:
The anthropoid suborder, also known as Haplorhini, is divided into two infraorders: Simiiformes and Tarsiiformes. The Simiiformes infraorder is further subdivided into two groups, Platyrrhini (New World monkeys) and Catarrhini (Old World monkeys, apes, and humans). Platyrrhines are distinct for their rounded nostrils and prehensile tails and are found in Central and South America. In contrast, Catarrhines, found in Africa and Asia, have narrow downward-facing nostrils and include the superfamilies Cercopithecoidea (cheek pouch monkeys and leaf-eating monkeys) and Hominoidea (apes and humans), which are known for not having tails and are largely terrestrial.