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 "Alphaproteobacteria" Garrity et al., 2006 [monotypic] Class Alphaproteobacteriaᵀ Garrity et al. 2006 Order Caulobacterales Henrici and Johnson 1935 (Approved Lists 1980) Family Caulobacteraceaeᵀ Henrici and Johnson 1935 (Approved Lists 1980) Genus Caulobacterᵀ Henrici and Johnson 1935 (Approved Lists 1980) Caulobacter segnis (Urakami et al. 1990) Abraham et al. 1999