[organisms] see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
   Prokaryota see Domain Prokaryota
     Class Cyanophyceae Schaffner (1909) see Class Cyanobacteria Cavalier-Smith, 2002
       Order Hormogonales Atkinson 1905
         Family Nostocaceae Eichler (1886)
           1 Genus Richelia J. Schmidt in Ostenfeld & J. Schmidt (1901)
           2 Genus Anabaena Bory 1822 ex Bornet & Flahault 1886 nom. cons. [ICBN]