Final answer:
Lemurs, lorises, pottos, aye-ayes, and sifakas having wet noses categorizes them as Strepsirrhini primates, which rely heavily on their sense of smell and are primarily nocturnal.
Step-by-step explanation:
Lemurs, lorises, pottos, aye-ayes, and sifakas are part of the suborder Strepsirrhini, commonly referred to as the wet-nosed primates. These primates exhibit distinctive features that set them apart from the Haplorhini primates, such as humans and monkeys. One notable characteristic of the Strepsirrhini primates is the presence of a wet nose on the exterior portion, which is associated with their reliance on the sense of smell. Members of this group tend to have larger olfactory centers in the brain compared to the Haplorhini. Strepsirrhini primates are typically nocturnal and are found mainly in the Old World, which includes the continents of Africa, Asia, and Europe. The aye-ayes are an intriguing example from Madagascar, known for their unique adaptations.