More on the Homunculus Dpm4 and M1 and comparisons with Alouatta and Stirtonia (primates, platyrrhini, cebidae)

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Abstract
The little-worn deciduous fourth premolar and first molar of a mandibular fragment of Homunculus sp are compared with the cast of a previously described deciduous lower fourth premolar of Homunculus grandis and with lower molariform teeth of Alouatta and Stirtonia. Lower molars of Alouatta can be derived from those like Homunculus, but because of the fragmentary nature of the fossils, it cannot be demonstrated that Alouatta evolved from Homunculus or is even closely related. Comparison of mandibles and upper and lower molariform teeth of Alouatta with those of Stirtonia indicate wide divergence from some distant, possibly basic platyrrhine stock.