Roman type
Physically, the black-capped squirrel monkey is very similar to a number of other species of squirrel monkey, but is distinguishable from other species by a number of features. The most noticeable of these are the dark black cap and the white ‘Roman type’ arch pattern over the monkey’s eyes, which is more narrow and rounded than the ‘Gothic type’ arch pattern over the eyes of the other species. The tail of the ‘Roman type’ species is also narrower than that of the ‘Gothic type’.