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 "Proteobacteria" Craig et al. 2010 Phylum "Betaproteobacteria" Garrity et al., 2006 [monotypic] Class Betaproteobacteriaᵀ Garrity et al. 2006 Order Neisseriales Tønjum 2006 Family Chromobacteriaceae Adeolu and Gupta 2013 Genus Aquaspirillum Hylemon et al. 1973 (Approved Lists 1980) Aquaspirillum arcticum Butler et al. 1990