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 Lyrellales D.G.Mann (1990)
         Family Lyrellaceae D.G.Mann (1990)
           Genus Petroneis Stickle & D.G.Mann (1990)
             Petroneis humerosaᵀ (Bréb. ex Wm. Sm.) Stickle & D.G.Mann (1990)