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?] Class "Nitrospira"ᵀ 2001 [monotypic] Order "Nitrospirales"ᵀ 2001 [monotypic] Family "Nitrospiraceae"ᵀ 2001 Genus Nitrospiraᵀ Watson et al. 1986 1 Nitrospira marinaᵀ Watson et al. 1986 2 Nitrospira moscoviensis Ehrich et al. 2001 3 Candidatus "Nitrospira bockiana" Lebedeva et al. 2008