Final answer:
Platyrrhines, or New World monkeys, typically have a dental formula of 2.1.3.3, which means they have 2 incisors, 1 canine, 3 premolars, and 3 molars per quadrant. Propliopithecus, an early primate, had a dental formula of 2.1.2.3, aligning them with catarrhine primates rather than platyrrhines.
Step-by-step explanation:
The question is inquiring about the dental formula of the only platyrrhine species, a group known as New World monkeys. Platyrrhines differ from their Old World counterparts with their unique dental formula. The typical dental formula for New World monkeys is 2.1.3.3, which indicates 2 incisors, 1 canine, 3 premolars, and 3 molars in each quadrant of the mouth. However, it is important to distinguish that Propliopithecus, sometimes thought of as an early New World monkey, shows a dental formula of 2.1.2.3 which actually aligns with catarrhine primates, and is not reflective of platyrrhine primates. The provided context on Propliopithecus reveals this misleading classification as they first appeared in Africa, the origin point for Old World primates.