Natura - nature actualia - actual entities Mundus Plinius - physical world naturalia - natural bodies Biota Domain Bacteria Woese et al. 1990 Phylum Acidobacteria Thrash and Coates 2012 Class Acidobacteriaᵀ Cavalier-Smith 2002 1 Genus Bryobacter Kulichevskaya et al. 2010, incertae sedis [monotypic] 2 Order Acidobacterialesᵀ Cavalier-Smith 2002 [monotypic]