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?] Phylum "Epsilonproteobacteria" Garrity et al., 2006 Class Epsilonproteobacteriaᵀ Garrity et al. 2006 Order Campylobacterales Garrity et al. 2006 Family Helicobacteraceae Garrity et al. 2006 Genus Helicobacterᵀ Goodwin et al. 1989 Helicobacter hepaticus Fox et al. 1994