[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
         Order Fragilariales P.C.Silva (1962)
           Family Fragilariaceae Grev. (1833)
             Genus Hannea R. Patrick, in R. Patrick & C.W. Reimer (1966) see Genus Hannaea R.M. Patrick (1966)
               1 Hannea arcus (Ehrenberg) R.M. Patrick see Hannaea arcus (Ehrenberg) R.M. Patrick