The skull of haplorhine (anthropoid) can be distinguished if it is a catarrhine or platyrrhine due to the features of the nose.
The two suborders of the anthropoid-dominated infraorder Simiiformes are platyrrhines and catarrhines. The primary distinction between platyrrhines and catarrhines is the presence of flat-nosed primates, such as New World monkeys, in the former group, whereas hooked-nosed primates, such as Old World monkeys, apes, and humans, are included in the latter group.
Furthermore, the catarrhines nostrils point downward while the nostrils of platyrrhines are closer together and spaced farther apart. Their tail, number of premolar teeth, thumb, and ectotympanic bone are the main features that set them apart from one another.
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