After Nelson, 1994, Bannikov & Tyler, 1995, Tyler & Bannikov, 1997, and Tyler, 2000

<==o Nasinae Smith, 1955
   |--+-- †Arambourgthurus scombrurus (Arambourg, 1956) [Arambourgthurus Tyler, 2000, Naseus scombrurus Arambourg, 1956] Oligoc. SWAs.
   |  `--+-- †Sorbinithurus sorbinii Tyler, 1999, Eoc.  
   |     `-- †Marosichthys huismani (Beaufort, 1926) Mioc. 
   `--+-- †Eonaso deani (Hussakof, 1907) M. Ter.
      `--o Naso [Naseus] M. Eoc. Eu. R. Oc. [17]
         |-- †N. rectifrons
         |-- N. annulatus (Quoy & Gaimard, 1825) (Whitemargin unicornfish)
         |-- N. brachycentron (Valenciennes, 1835) (Humpback unicornfish)
         |-- N. brevirostris (Valenciennes, 1835) (Spotted unicornfish)
         |-- N. caeruleacauda Randall, 1994
         |-- N. caesius Randall & Bell, 1992
         |-- N. fageni Morrow, 1954 (Horseface unicornfish)
         |-- N. hexacanthus (Bleeker, 1855) (Sleek unicornfish)
         |-- N. lituratus (Forster, 1801) (silosarvikala; Orangespine unicornfish)
         |-- N. lopezi Herre, 1927 (Elongate unicornfish)
         |-- N. maculatus Randall & Struhsaker, 1981
         |-- N. minor (Smith, 1966) (Slender unicorn)
         |-- N. thorpei Smith, 1966 (Thorpe's unicornfish)
         |-- N. thynnoides (Valenciennes, 1835) (Oneknife unicornfish)
         |-- N. tuberosus Lacepède, 1801 (Humpnose unicornfish)
         |-- N. unicornis (Forsskål, 1775) (Bluespine unicornfish)
         `-- N. vlamingii (Valenciennes, 1835) (Bignose unicornfish)

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