After Mckenna & Bell, 1997, and MacPhee & Flemming, 2003

<==o †Heptaxodontidae Anthony, 1917 [taxonomic history] (antillienhutiat)
   |?- †Tetrastylomys Kraglievich, 1926; U.Mioc. SA.
   |?- †Pentastylomys Kraglievich, 1926; U.Mioc. SA.
   |?- †Quemisia gravis Miller, 1929; Pleist. Caribb. [Hispaniola] (Hispaniolan Giant Hutia, Quemi) [treated as capromyid by McKenna & Bell, 1997]
   |--o †Clidomyinae Woods, 1989
   |  |?- †Alterodon major (Anthony, 1920); Pleist. Caribb. [Jamaica] (nomen dubium, possibly synonymous with Clidomys osborni Anthony, 1920?)
   |  `--o †Clidomys
   |     |-- †C. osborni Anthony, 1920 [incl.? Speoxnus cundalli Anthony, 1920; Spirodontomys jamaicensis Anthony, 1920] (Larger Jamaican Giant Hutia)
   |     `?- †C. parvus Anthony, 1920 [=? C. osborni Anthony, 1920] (Smaller Jamaica Giant Hutia)
   `--o †Heptaxodontinae Anthony, 1917 [incl. †Amblyrhizinae Schaub, 1951]
      |?- †Xaymaca fulvopulvis MacPhee & Flemming, 2003
      |-- †Amblyrhiza inundata (Lesser Antillean Giant Hutia)
      `-- †Elasmodontomys obliquus (Anthony, 1916) [incl. Heptaxodon bidens Anthony, 1917] (Puerto Rican Giant Hutia)

Reference(s):