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] Phylum Euryarchaeota Garrity and Holt 2001 Class Thermococci Zillig and Reysenbach 2002 [monotypic] Order Thermococcalesᵀ Zillig 1988 [monotypic] Family Thermococcaceaeᵀ Zillig 1988 Genus Thermococcusᵀ Zillig 1983 Thermococcus gammatolerans Jolivet et al. 2003