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] Bacteria Woese et al. 1990 [paraphyletic?] Spirochaetales Buchanan 1917 (Approved Lists 1980), sedis mutabilis 1 Exilispira thermophila Imachi et al. 2008, incertae sedis 2 Spirochaetaceae Swellengrebel 1907 (Approved Lists 1980) 3 Borreliaceae Gupta et al. 2014