[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 Bacillariales Hendey (1937)
           Family Bacillariaceae Ehrenb. (1831)
             Genus Fragilariopsis Hust. (1913)
               Fragilariopsis cylindrus (Grunow, 1882) Krieger, in Helmcke & Krieger (1954)