Final answer:
A short, broad, flattened nose is identified as Platyrrhine, which is a trait of New World monkeys.
Step-by-step explanation:
A short, broad, flattened nose is identified as Platyrrhine. The term Platyrrhine refers to primates typically found in the New World, specifically Central and South America. These primates, known as New World monkeys, have nostrils that are rounded and open to the sides. They are contrasted with Catarrhines, or Old World primates, which are found in Africa and Asia and have narrow nostrils that face downwards. The other options like Leptorrhine and Mesorrhine refer to other nasal typologies not directly relevant in this context.