After Froese & Pauly, 2001, Morris, de Queiroz & Morizot, 2001 and Kallman, Walter, Morizot & Kazianis, 2004

<==o Xiphophorus (miekkapyrstöt ja pladyt; swordtails & platyfishes) [Gh: 17] [FB: 23]
   |?- X. andersi Meyer & Schartl, 1980
   |?- X. couchianus (Girard, 1859) (Monterrey platyfish)
   |?- X. evelynae Rosen, 1960 (Puebla platyfish)
   |?- X. gordoni Miller & Minckley, 1963 (Northern platyfish)
   |?- X. kosszanderi Meyer & Wischnath, 1981
   |?- X. maculatus (Günther, 1866) (platy; Southern platyfish)
   |?- X. meyeri Schartl & Schröder, 1988
   |?- X. milleri Rosen, 1960
   |?- X. xiphidium (Gordon, 1932)
   |-- X. variatus (Meek, 1904) (kirjoplaty; Variable platyfish)
   |--o X. hellerii -group
   |  |-- X. hellerii Heckel, 1848 (miekkapyrstö; Green swordtail)
   |  |-- X. alvarezi Rosen, 1960
   |  `-- X. signum Rosen & Kallman, 1969
   `--+--o X. clemenciae -group
      |  |-- X. monticolus Kallman, Walter, Morizot & Kazianis, 2004
      |  `--+-- X. mixei Kallman, Walter, Morizot & Kazianis, 2004
      |     `-- X. clemenciae Alvarez, 1959 (Yellow swordtail)
      `--+-- X. malinche Rauchenberger, Kallman & Mozirot, 1990
         `--+-- X. cortezi Rosen, 1960
            `--+-- X. birchmanni Lechner & Radda, 1987
               `--+--+-- X. pygmaeus Hubbs & Gordon, 1943 (Pygmy swordtail)
                  |  `--+-- X. multilineatus Rauchenberger, Kallman & Morizot, 1990
                  |     `-- X. nigrensis Rosen, 1960
                  `--+-- X. nezahualcoyotl Rauchenberger, Kallman & Morizot, 1990
                     `--+-- X. continens Rauchenberger, Kallman & Morizot, 1990
                        `-- X. montezumae Jordan & Snyder, 1899 (Montezuma swordtail)

Reference(s):