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] Superphylum TACK Guy and Ettema 2011 Phylum Crenarchaeota Garrity and Holt 2001 Class Thermoprotei Reysenbach 2002 Order Thermoprotealesᵀ Zillig and Stetter 1982 Family Thermofilaceae Burggraf et al. 1997 [monotypic] 1 Genus Thermofilumᵀ Zillig and Gierl 1983 [monotypic]