[organisms] see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
   Eukaryota Chatton, 1925 - eukaryotes see Domain Eukaryota Chatton, 1925
     Class Bacillariophyceae Haeckel (1878) - pennates
       Subclass Bacillariophycidae D.G.Mann (1990) - raphid diatoms
         Order Naviculales Bessey (1907)
           Suborder Neidiineae D.G.Mann (1990)
             Family Pleurosigmataceae Mereschk. (1903)
               Genus Pleurosigma W.Sm. (1852)
                 1 Pleurosigma angulatum (E.J. Quekett) W.Sm. (1852)
                 2 Pleurosigma delicatulum W.Sm.
                 3 Pleurosigma elongatum W.Sm.
                 4 Pleurosigma formosum W.Sm.
                 5 Pleurosigma macrum W.Sm.
                 6 Pleurosigma normani Ralfs, in Pritchard see Pleurosigma normanii Ralfs, in Pritchard (1861)
                 7 Pleurosigma rigidum W.Sm.