Division Bacillariophyta Engl. & Gilg (1919) see Phylum Bacillariophyta Engl. & Gilg (1919)
   Class Coscinodiscophyceae Round & R.M. Crawford (1990) - radial centrics
     Subclass Rhizosoleniophycidae Round & R.M. Crawford (1990)
       Order Rhizosoleniales P.C.Silva (1962)
         Family Rhizosoleniaceae De Toni (1890)
           1 Genus Rhizosoleniaᵀ Brightw. (1858)
           2 Genus Proboscia Sundström (1986)
           3 Genus Pseudosolenia Sundström (1986)
           4 Genus Urosolenia Round & R.M. Crawford (1990) [monotypic]
           5 Genus Guinardia H. Perag. (1892)
           6 Genus Dactyliosolen Castrac. (1886)