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 Negativicutes Marchandin et al. 2010 [monotypic] 1 Order Acidaminococcales Campbell et al. 2015 [monotypic] 2.1 Order Selenomonadales Marchandin et al. 2010 2.2 Order Veillonellales Campbell et al. 2015 [monotypic]