What are the three infraorders of haplorrhines?

The three infraorders of haplorrhines are Tarsiiformes, Platyrrhini, and Catarrhini.

Tarsiiformes includes the tarsiers, small primates that are adapted for an arboreal lifestyle. Platyrrhini refers to the New World monkeys, characterized by their flat noses and prehensile tails, allowing them to navigate the trees of South America effectively. Catarrhini encompasses both the Old World monkeys and apes, including humans, and is distinguished by having downward-facing nostrils.

Understanding these groups is crucial in anthropology and primatology because they reflect significant evolutionary adaptations to different environments and lifestyles among primates. Each of these infraorders represents distinct paths of evolution within the primate lineage.