After Gingerich et al., 2001 and Thewissen et al., 2001

Alternative [older] phylogeny of “Paraxonia” after O'Leary, 1998.

<==o “Paraxonia” (sorkkaeläintensukuiset ungulaatit; artiodactyl-like ungulates; even-toed ungulates)
   |?- †Olsenia Matthew & Granger, 1925
   |-- †Andrewsarchus mongoliensis Osborn, 1924
   `--+--o †Triisodontidae Trouessart, 1904 [Arctocyonidae: Triisodontinae]
      |  |--o †Goniacodon Scott, 1892
      |  |  |-- †G. hiawathae Van Valen, 1978
      |  |  `-- †G. levisanus (Cope, 1883)
      |  `--+--o †Eoconodon Matthew & Granger, 1921; U.Pal. WNA.
      |     |  |-- †E. nidhoggi Van Valen, 1978
      |     |  |-- †E. gaudrianus (Cope, 1888)
      |     |  |-- †E. sp. cf. E. gaudrianus [Clemens & Williamson, 2005]
      |     |  |-- †E. ginibitohia Clemens & Williamson, 2005 [E. sp. cf. E. copanus Williamson & Lucas, 1993; E. sp. nov. Williamson, 1996]
      |     |  |-- †E. coryphaeus (Cope, 1855) [Mioclaenus bathygnathus; Triisodon biculminatus]
      |     |  `-- †E. copanus Van Valen, 1978
      |     `--+-- †Stelocyon arctylos Gingerich, 1978
      |        `--o †Triisodon Cope, 1881
      |           |-- †T. quivirensis Cope, 1881
      |           `-- †T. crassicuspis (Cope, 1882)
      `--+?- †Microclaenodon assurgens Scott, 1892
         `--+-- †Mesonychia Van Valen, 1966 [Acreodi] (mesonykit; mesonychians)
            `--o Cetartiodactyla Montgelard et al., 1997
               `-- Artiodactyla Owen, 1848 [incl. Cetacea Brisson, 1762] (sorkkaeläimet; artiodactyls and whales)

Reference(s):