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)
                         01 ?Aquaspirillum dispar Hylemon et al. 1973 (Approved Lists 1980)
                         02 Aquaspirillum arcticum Butler et al. 1990
                         03 Aquaspirillum polymorphum (Williams and Rittenberg 1957) Hylemon et al. 1973 (Approved Lists 1980)
                         04 Aquaspirillum putridiconchylium (Terasaki 1961) Hylemon et al. 1973 (Approved Lists 1980)
                         05 Aquaspirillum serpens (Müller 1786) Hylemon et al. 1973 (Approved Lists 1980)