[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
     Supergroup Chromalveolata Adl et al., 2005 - chromalveolates see Kingdom Chromista Caval.-Sm. (1981)
       Stramenopiles Patterson, 1990 - stramenopiles see Superphylum Heterokonta Caval.-Sm. (1986)
         Bacillariophyta Engl. & Gilg (1919) - diatoms see [unranked] Diatomea Kütz. (1844)
           Coscinodiscophytina Medlin & Kaczmarska (2004) see Subphylum Khakista Caval.-Sm. (2000)
             arachnoidiscids D.G.Mann, in S.M. Adl et al. (2005)
               1 Genus Arachnoidiscus H. Deane pat. ex Shadbolt (1852)