Mean Ratio of P4/M1 area in Cercocebus atys and Higher Taxa.

Data compiled from ref 19 except for Cercocebus atys which was derived from individuals collected under the Tai Monkey project (N = 8 females, 9 males); australopith data from refs 11,32. Other values represent the average of species means within higher taxa. Species ratio was calculated as the average of male and female means; these means were calculated as the mean P4 area/mean M1 area, with areas calculated as the product of mesiodistal and buccolingual dimensions.Mean ratio value for Anthropoidea includes australopith data. Mean values for individual taxa used in determination of included taxon values are provided in Table S1.