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 Rickettsiales Gieszczykiewicz 1939 (Approved Lists 1980) Genus Lyticum (ex Preer et al. 1974) Preer and Preer 1982, incertae sedis Lyticum sinuosum (ex Preer et al. 1974) Preer and Preer 1982