Supergroup Rhizaria Cavalier-Smith, 2002 see Infrakingdom Rhizaria Cavalier-Smith, 2002
   Phylum Foraminifera d'Orbigny, 1826 see Subphylum Foraminifera d'Orbigny, 1826
     Class Nodosariata Mikhalevich, 1992
       Subclass Nodosariana Mikhalevich, 1992
         Order Nodosariida Calkins, 1926
           Suborder Nodosariina Calkins, 1926
             Superfamily Nodosarioidea Ehrenberg, 1838
               Family Frondiculariidae Reuss, 1860
                 Subfamily Tristixinae Mikhalevich, 2013
                   Genus Tristix MacFadyen, 1941