After McKenna & Bell, 1997 and Goin, Sánchez-Villagra, Kay, Anaya-Daza & Takai, 2003

<==o †Palaeothentidae (Sinclair, 1906) Osgood, 1921 [Epanorthidae Ameghino, 1889]
   |?- †Hondathentes cazador Dumont & Bown, in Bown & Fleagle, 1993
   |--o †Acdestinae Bown & Fleagle, 1993
   |  |--o †Acdestoides Bown & Fleagle, 1993
   |  |  |-- †A. praecursor [?Acdestis praecursor]
   |  |  `-- †A. bonapartei
   |  |-- †Acdestodon Bown & Fleagle, 1993
   |  |-- †Trelewthentes rothi Bown & Fleagle, 1993
   |  `--o †Acdestis Ameghino, 1887
   |     |-- †A. robustus
   |     |-- †A. spegazinii
   |     |-- †A. columnaris
   |     |-- †A. gracilis
   |     |-- †A. ligatus [Callomenus ligatus]
   |     |-- †A. obusta
   |     |-- †A. lemairei
   |     |-- †A. oweni
   |     `-- †A. maddeni Goin, Sánchez-Villagra, Kay, Anaya-Daza & Takai, 2003
   `--o †Palaeothentinae Sinclair, 1906
      |--o †Palaeothentes Ameghino, 1887 [Synonyms]
      |  |-- †P. aratae
      |  |-- †P. intermedius
      |  |-- †P. lemoinei
      |  |-- †P. marshalli
      |  |-- †P. migueli
      |  |-- †P. minutus
      |  |-- †P. pascuali
      |  `-- †P. primus
      |-- †Titanothentes Rae, Bown & Fleagle, 1996
      |-- †Pilchenia lucina Ameghino, 1903
      |-- †Carlothentes chubutensis Bown & Fleagle, 1993
      `--o †Propalaeothentes Bown & Fleagle, 1993
         |-- †P. hatcheri
         `-- †P. lepidus

Reference(s):

 

Special thanks to:

Jos H. M. Dols, for gathering additional information and missing species.