[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 Coscinodiscophyceae Round & R.M. Crawford (1990) - radial centrics
       Subclass Biddulphiophycidaea (Round & Crawford, in Round et al., 1990) see Subclass Biddulphiophycidae Round & R.M. Crawford (1990)
         Order Hemiaulales Round & R.M. Crawford (1990)
           Family Streptothecaceae R.M. Crawford (1990)
             Genus Streptotheca Shrubsole (1890) see Genus Helicotheca Ricard (1987)
               1 Streptotheca thamesis Shrubsole