Natura - nature actualia - actual entities Mundus Plinius - physical world naturalia - natural bodies [crown] Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020] Domain Bacteria Woese et al. 1990 [paraphyletic?] Superphylum Terrabacteria Battistuzzi et al. 2004 Phylum Cyanobacteria (ex Stanier 1974) Cavalier-Smith 2002 - cyanobacteria Class "Cyanobacteria" Cavalier-Smith, 2002 Subclass Oscillatoriophycideae Order Oscillatorialesᵀ Elenkin (1934) Family Phormidiaceae Anagnostidis & Komárek (1988) Subfamily Phormidioideaeᵀ Genus Porphyrosiphon F.T. Kützing ex Gomont (1892) Porphyrosiphon martensianus (G. Meneghini ex M. Gomont) K. Anagnostidis and J. Komárek 1988