[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 Thalassiosiraceae M. Lebour (1930), nom. cons.
             Genus Thalassiosira Cleve (1873)
               01 Thalassiosira allenii Takano
               02 Thalassiosira angulata (Gregory) Hasle (1978)
               03 Thalassiosira anguste-lineata (A.Schmidt) G. Fryxell & Hasle (1977)
               04 Thalassiosira decipiens (Grunow, in Van Heurck) Jörgensen (1905)
               05 Thalassiosira eccentrica (Ehrenberg) Cleve (1903)
               06 Thalassiosira gravida Cleve (1896)
               07 Thalassiosira hyalina (Grunow, in Cleve & Grunow, 1880) Gran
               08 Thalassiosira nordenskioeldii Cleve (1873)
               09 Thalassiosira rotula Meunier (1915)
               10 Thalassiosira subtilis (Ostenfeld) Gran
               11 Thalassiosira tenera Proshkina-Lavrenko (1961)
               12 Thalassiosira weissflogii (Grunow) G. Fryxell & Hasle (1977)