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 Desulfurococcales Huber and Stetter 2002 Family Desulfurococcaceaeᵀ Zillig and Stetter 1983 Genus Thermosphaera Huber et al. 1998 [monotypic] 1 Thermosphaera aggregansᵀ Huber et al. 1998