Final answer:
Primates are the subject of this question, specifically the group comprising New World monkeys, marmosets, and tamarins. They have specific characteristics such as five fingers, various types of teeth, specific eye orbit characteristics, and an opposable thumb.
Step-by-step explanation:
The subject of this question is primates which belong to the suborder Haplorrhini in the order Primates. It specifically refers to the group of primates known as New World monkeys, marmosets, and tamarins. These primates can be found in Central and South America and have characteristics such as five fingers, various types of teeth, specific eye orbit characteristics, and an opposable thumb.