[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 Coscinodiscophycidae Round & R.M. Crawford (1990)
         Order Coscinodiscales Round & R.M. Crawford (1990)
           Family Hemidiscaceae Hendey (1937)
             Genus Actinocyclus Ehrenb. (1837)
               Actinocyclus ralfsii (W.Sm.) Ralfs, in Pritchard