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)
             Genus Campylobacter Sebald and Véron 1963 (Approved Lists 1980)
               1 Campylobacter fetus (Smith and Taylor 1919) Sebald and Véron 1963 (Approved Lists 1980)
               2 Campylobacter sputorum (Prévot 1940) Véron and Chatelain 1973 (Approved Lists 1980)
               3 Campylobacter fecalis