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 Sulfolobales Stetter 1989 [monotypic] Family Sulfolobaceaeᵀ Stetter 1989 Genus Sulfurococcus Golovacheva et al. 1995 1 Sulfurococcus mirabilisᵀ Golovacheva et al. 1995 2 Sulfurococcus yellowstonensis corrig. Karavaiko et al. 1995