Final answer:
The colobine subfamily is composed of leaf-eating monkeys known as Colobinae, including langurs, colobus monkeys, and proboscis monkeys, found throughout Africa and Asia.
Step-by-step explanation:
What types of monkeys make up the colobine subfamily? The colobine subfamily, part of the Haplorrhini suborder, includes different species of leaf-eating monkeys known as Colobinae. These monkeys are part of the Catarrhini infraorder and are distinguished from other primates by their unique characteristics. The Catarrhini are further divided into two superfamilies: the Cercopithecoidea, which includes the cheek pouch monkeys (Cercopithecinae) and leaf-eating monkeys (Colobinae), and the Hominoidea, which comprises apes and humans.
The Colobinae or leaf-eating monkeys typically exhibit adaptations suited for a folivorous diet, including complex stomachs for digesting leaves. Well-known members of the colobine subfamily include different species of langurs, colobus monkeys, and proboscis monkeys, which are found throughout Africa and Asia. As a notable characteristic, Colobinae species have molars with two parallel ridges that are essential for grinding down fibrous plant material.