Final answer:
The two groups of monkeys under Strepsirrhini/Prosimian are the lemurs, predominantly found in Madagascar, and lorises, native to Southeast Asia. These groups are characterized by primitive traits such as a grooming claw and a toothcomb.
Step-by-step explanation:
The order Primates is broadly categorized into two groups: Strepsirrhini, commonly known as prosimians, and Haplorrhini, known as anthropoids. The two groups of monkeys categorized under the suborder Strepsirrhini/Prosimian are the lemurs and the lorises. Lemurs predominantly reside on the island of Madagascar, exhibiting various traits such as a nocturnal lifestyle, a smaller brain relative to their body size, a grooming claw on their second toe, and a toothcomb formed by their lower incisors. Lorises, found in Southeast Asia, share several of these primitive characteristics. Apart from these, no other true monkeys are categorized under Strepsirrhini/Prosimian, as monkeys fall under the Haplorrhini suborder, specifically the infraorders Simiiformes (New World and Old World monkeys) and Tarsiiformes (tarsiers).