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 Terrabacteria Battistuzzi et al. 2004 Phylum Firmicutes corrig. Gibbons and Murray 1978 (Approved Lists 1980) Class Mollicutes Edward and Freundt 1967 (Approved Lists 1980) 1 Order Mycoplasmatales Freundt 1955 (Approved Lists 1980) [monotypic] 2 Order Entomoplasmatales Tully et al. 1993 3 Order Acholeplasmatales Freundt et al. 1984 [monotypic] 4 Order Anaeroplasmatales Robinson and Freundt 1987 [monotypic] 5 Order Haloplasmatales Rainey et al. 2008 [monotypic]