After Rasmussen, 2002

<==o †Oligopithecidae Kay & Williams, 1994
   |?- †Proteopithecus sylviae Simons, 1989 [Proteopithecidae Simons, 1989]
   `--+-- †Catopithecus browni Simons, 1989
      `--o †Oligopithecus Simons, 1962
         |-- †O. savagei Simons, 1962
         `-- †O. rogeri Gheerbrant et al., 1995

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