[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 Pseudo-nitzschia H. Peragallo, in H. Peragallo & M. Peragallo (1900)
               1 Pseudo-nitzschia delicatissima (P.T. Cleve) Heiden, in Heiden & Kolbe
               2 Pseudo-nitzschia fraudulenta (Cleve) G.R. Hasle
               3 Pseudo-nitzschia pseudodelicatissima (Cleve) Hasle
               4 Pseudo-nitzschia pungens (Grunow, in Cleve & Möller, 1882 ex P.T. Cleve) Hasle