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] Clade neomura Cavalier-Smith, 1987 Domain Archaea Woese et al. 1990 [paraphyletic] [Kingdom "Crenarchaeota" Woese et al. 1990] see Phylum Crenarchaeota Garrity and Holt 2001 [Genus Caldococcus] 3.0 [Order "Igneococcales" Burggraf et al. 1997 nom. inval.]