Division Bacillariophyta Engl. & Gilg (1919) see Phylum Bacillariophyta Engl. & Gilg (1919)
   Class Bacillariophyceae Haeckel (1878) - pennates
     Subclass Bacillariophycidae D.G.Mann (1990) - raphid diatoms
       Order Naviculales Bessey (1907)
         Suborder Neidiineae D.G.Mann (1990)
           Family Cavinulaceae D.G.Mann (1990)
             Genus Cavinulaᵀ D.G.Mann & Stickle (1990)
               Cavinula lacustris (Gregory) D.G.Mann & Stickle (1990)