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 Clostridia Rainey 2010 Order Thermoanaerobacterales Wiegel 2010 Family Thermoanaerobacteraceaeᵀ Wiegel 2010 Genus Caldanaerobacter Fardeau et al. 2004 Caldanaerobacter subterraneusᵀ (Fardeau et al. 2000) Fardeau et al. 2004 Caldanaerobacter subterraneus subsp. yonseiensis (Kim et al. 2001) Fardeau et al. 2004