After McKenna & Bell, 1997, and Gebo, 2002

<==o †Nothactinae Trouessart, 1879 [Pelycodinae]
   |--o †Cantius Simons, 1962a
   |  |-- †C. abditus [Pelycodus abditus]
   |  |-- †C. antediluvius
   |  |-- †C. eppsi Cooper, 1932
   |  |-- †C. mckennai
   |  |-- †C. nuniensis
   |  |-- †C. ralstoni [Pelycodus ralstoni]
   |  |-- †C. savagei Gingerich, 1977a
   |  |-- †C. torresi
   |  |-- †C. trigonodus [Pelycodus triconodus]
   |  `--o †(Neocantius)
   |     |-- †C. (N.) angulatus (Cope, 1875) [Pelycodus angulatus Cope, 1875]
   |     |-- †C. (N.) frugivorus [Pelycodus frugovorus]
   |     `-- †C. (N.) venticolus
   |--o †Notharctus Leidy, 1870c [Hipposyus, Limnotherium, Prosinopa, Telmalestes, Telmatolestes, Thinolestes, Tomitherium]
   |  |?- †N. affine [Limnotherium affine]
   |  |?- †N. formosus [Hipposyus formosus]
   |  |?- †N. gracilis
   |  |?- †N. grassus
   |  |?- †N. limosus
   |  |?- †N. nunensis (Cope, 1881) [N. nunieus lapsus calami?; =? Cantius nuniensis]
   |  |-- †N. pugnax
   |  |?- †N. robinsoni Gingerich, 1979
   |  |-- †N. robustior Leidy, 1872b
   |  |-- †N. tenebrosus Leidy, 1870c
   |  |-- †N. tyrannus [Limnotherium tyrannus]
   |  `-- †N. venticolus [=? Cantius (Neocantius) venticolus]
   |--o †Pelycodus Cope, 1875
   |  |-- †P. danielsae
   |  `-- †P. jarrovii Cope, 1875
   |--o †Copelemur Gingerich & Simons, 1977
   |  |?- †C. feretutus
   |  |?- †C. consortutus
   |  |-- †C. australotutus
   |  |-- †C. praetutus
   |  `-- †C. tutus (Cope, 1877) [Pelycodus tutus Cope, 1877]
   |--o †Smilodectes Wortman, 1903 [Aphanolemur]
   |  |-- †S. gracilis (Marsh, 1871a)
   |  |-- †S. mcgrewi Gingerich, 1979
   |  `-- †S. gingerichi
   `-- †Hesperolemur actius Gunnell, 1995

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