[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 Thalassiosirophycidae Round & R.M. Crawford (1990) see Class Mediophyceae Medlin & Kaczmarska (2004)
         Order Thalassiosirales Glezer & I.V. Makarova (1986)
           Family Skeletonemataceae M. Lebour (1930)
             Genus Skeletonema Grev. (1865)
               Skeletonema costatum (Grev.) Cleve (1873)