Final answer:
The suborder distinguishing lemurs and lorises is Strepsirrhini, which is characterized by distinct traits like a grooming claw and a toothcomb.
Step-by-step explanation:
The suborder used to distinguish the lemurs and lorises is Strepsirrhini. These primates, also known as strepsirrhines, exhibit several distinct traits separating them from the Haplorrhini primates or haplorhines. Unique strepsirrhine features include a grooming claw on their second toe and a toothcomb formed by incisors tightly packed together and protruding from the lower jaw.
There are seven families of these living strepsirrhines, all of which are from the Old World regions of Africa, Asia, and Europe. Notably, five of these groups reside exclusively on the island of Madagascar, while two families extend their habitat to Africa and Asia. By contrast, the Haplorrhini suborder, which includes tarsiers and simians such as monkeys, apes, and humans, exhibits different traits, such as downward facing narrow nostrils in the case of Old World primates and prehensile tails found in New World monkeys.