[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 Fragilariophyceae Round (1990) - araphid, pennate diatoms see Class Bacillariophyceae Haeckel (1878)
       Subclass Fragilariophycidae Round (1990) - core araphid diatoms
         1 Order Fragilariales P.C.Silva (1962)
         2 Order Tabellariales Round (1990)
         3 Order Licmophorales Round (1990)
         4 Order Thalassionematales Round (1990)
         5 Order Rhabdonematales Round & R.M. Crawford (1990)
         6 Order Striatellales Round (1990)