Prohegetotherium comprises three species, P. sculptum, P. schiaffinoi, and P. malalhuense.[2] Although Prohegetotherium shumwayi and P. crassus have long been synonymized with P. sculptum, Kramarz and Bond (2017) restricted P. sculptum to the holotype, rejecting the synonymy.[4]
^A. G. Kramarz and M. Bond. 2017. Systematics and stratigraphical range of the hegetotheriids Hegetotheriopsis sulcatus and Prohegetotherium sculptum (Mammalia: Notoungulata). Journal of Systematic Palaeontology 15(12):1027-1036