The small number of fossils, along with the small size of the primate, has made the taxonomic classification of Qatrania quite difficult. For Qatrania , the metric values being compared are premolar and molar dimensions.
Body size is important in assigning a phylogeny because it is an indication of diet preference.
Qualitative data of dental morphology is also a good indicator of diet preference. Sharp cusps serve a puncturing function used to break up the exoskeletons of insects, while round cusps are designed to grind vegetable material. Its low, bulbous cusps appear to be an adaptation to frugivory, although one might expect that Qatrania s small size would favor insectivory. Through the comparison of various primate dental dimensions with those of Qatrania , an attempt to determine its phylogeny is made. The dental dimensions and OSAI of Qatrania wingi , Catopithecus, Parapithecus grangeri , Propliopithecus, squirrel monkey, and Macaca arctoides will be compared using premolar and molar dimensions.