After Nowak, 1991, Morgan & Morgan, 1995, McKenna & Bell, 1997, Janis & Manning, 1998, and Alroy, 2002

<==o Antilocapridae (pronghorns; hanka-antiloopit)
   |--o †Paracosoryx Frick, 1937 [paraphyletic Merycodontinae Matthew, 1909; Cosoryctinae]
   |  |-- †P. wilsoni Frick, 1937
   |  |-- †P. alticornis Frick, 1937
   |  |-- †P. dawesensis Frick, 1937
   |  |-- †P. furlongi Frick, 1937
   |  |-- †P. loxoceros (Furlong, 1935) [Merycodus loxoceros Furlong, 1935]
   |  `-- ?†P. nevadensis (Merriam, 1911) [Merycodus nevadensis Merriam, 1911]
   `--+--o †Ramoceratini
      |  |-- †Merriamoceros coronatus (Merriam, 1913) Frick, 1937 [paraphyletic Merycodontinae Matthew, 1909; Cosoryctinae]
      |  `--o †Ramoceros Frick, 1937 [Paramoceros Frick, 1937] [paraphyletic Merycodontinae Matthew, 1909; Cosoryctinae]
      |     |-- †R. osborni (Matthew, 1904) [Merycodus osborni Matthew, 1904; R. hitchcockensis Frick, 1937; R. howardae Frick, 1937; R. kansanus Frick, 1937]
      |     |-- †R. ramosus (Cope, 1874) [Cosoryx ramosus Cope, 1874]
      |     `--o †(Paramoceros) Frick, 1937
      |        |-- †R. (P.) brevicornis Frick, 1937
      |        |-- †R. (P.) marthae Frick, 1937
      |        `-- †R. (P.) palmatus Frick, 1937
      `--+?-o †Meryceros Frick, 1937 [jr. synon. of Merycodus?]
         |  |-- †M. warreni (Leidy, 1858) [Cervus warreni Leidy, 1858]
         |  |-- †M. crucensis Frick, 1937
         |  |-- †M. hookwayi (Furlong, 1935) [Merycodus hookwayi Furlong, 1935]
         |  |-- †M. joraki Frick, 1937
         |  |-- †M. major Frick, 1937
         |  `-- †M. nenzelensis Frick, 1937
         |?-o †Submeryceros Frick, 1937 [jr. synon. of Merycodus?]
         |  |-- †S. crucianus Frick, 1937
         |  |-- ?†S. minimus Frick, 1937
         |  `-- ?†S. minor Frick, 1937
         |--o †Merycodus Leidy, 1854 [Subcosoryx, Subparacosoryx] [paraphyletic Merycodontinae Matthew, 1909; Cosoryctinae]
         |  |-- †"M." sabulonis (Matthew & Cook, 1909) [M. nectatus sabulonis (Matthew & Cook) Matthew, 1924; Cosoryx [Paracosorys] sabulonis (Matthew & Cook) Frick, 1937; Cosoryx [Subparacosoryx] savaronis Frick, 1937]
         |  `-- †M. necatus Leidy, 1854
         `--+--o †Cosoryx Leidy, 1869 [Subcosoryx Frick, 1937] [paraphyletic Merycodontinae Matthew, 1909; Cosoryctinae]
            |  |-- †C. furcatus Leidy, 1869
            |  |?- ?†C. agilis Douglass, 1899
            |  |-- †C. ilfonensis Frick, 1937
            |  |-- †C. trilateralis
            |  `-- †C. (Subcosoryx) cerroensis Frick, 1937
            `-- Antilocaprinae Brooke, 1876 (pronghorns; hanka-antiloopit)

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