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 Bacilli Ludwig et al. 2010 Order Bacillalesᵀ Prévot 1953 (Approved Lists 1980) Family Alicyclobacillaceae da Costa and Rainey 2010 Genus Alicyclobacillusᵀ Wisotzkey et al. 1992 Alicyclobacillus acidocaldarius (Darland and Brock 1971) Wisotzkey et al. 1992 1 Alicyclobacillus acidocaldarius subsp. acidocaldariusᵀ (Darland and Brock 1971) Nicolaus et al. 2002 2 Alicyclobacillus acidocaldarius subsp. rittmannii Nicolaus et al. 2002