mainly after McKenna & Bell, 1997

<==o †Phenacodonta
   |?- †Ocepeia daouiensis Gheerbrant & Sudre, in Gheerbrant, Sudre, Iarochene & Moumni, 2001
   |--o †Meniscotheriidae
   |  |-- †Ectocion osbornianus Cope, 1882b[Gidleyina, Prosthecion]
   |  `--o †Meniscotherium Cope, 1874 [Hyracops]
   |     |-- †M. tapiacitis
   |     |-- †M. robustum
   |     `-- †M. chamense Cope, 1874
   `--o †Phenacodontidae
      |?- †Phenacodontidae genera et species indet. L. Paleoc., SEAs. [McKenna & †Chow, 2001]
      |?- †Almogaver
      |?- †Eodesmatodon
      |-- †Paraphenacodus solivagus
      |-- †Tetraclaenodon puercensis [Euprotogonia; T. septentrionalis]
      `--+-- †Copecion brachypternus?
         `--o †Phenacodus
            |-- †P. primaevus
            |-- †P. vortmani
            `-- †P. trilobatus

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