Kingdom Protoctista Hogg, 1860
   Phylum Bacillariophyta Engl. & Gilg (1919) - diatoms see [unranked] Diatomea Kütz. (1844)
     Class Bacillariophyceae Haeckel (1878) - pennates
       Subclass Eunotiophycidae D.G.Mann (1990) see Subclass Bacillariophycidae D.G.Mann (1990)
         Order Eunotiales P.C.Silva (1962)
           Family Eunotiaceae Kütz. (1844)
             1 Genus Eunotia Ehrenb. (1837)
             2 Genus Actinella F.W. Lewis (1864), nom. cons.
             3 Genus Desmogonium Ehrenb. (1848)
             4 Genus Semiorbis R.M. Patrick (1966)