living organisms see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
   Superkingdom Prokaryotae see Superkingdom Prokarya
     Kingdom Monera Haeckel 1866 see Domain Bacteria Woese et al. 1990
       Division Bacteria (Haeckel 1894) see Domain Bacteria Woese et al. 1990
         "Spiral and curved bacteria"
           Family Spirillaceae Migula 1894 (Approved Lists 1980)
             1 Genus Campylobacter Sebald and Véron 1963 (Approved Lists 1980)
             2 Genus Spirillum Ehrenberg 1832 (Approved Lists 1980)
             3 Genus Aquaspirillum Hylemon et al. 1973 (Approved Lists 1980)
             4 Genus Oceanospirillum Hylemon et al. 1973 (Approved Lists 1980)
             5 Genus Azospirillum Tarrand et al. 1979 (Approved Lists 1980)
             6 Genus Bdellovibrio Stolp and Starr 1963 (Approved Lists 1980)