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 "Methanomicrobia" Order Methanomicrobialesᵀ Balch and Wolfe 1981 Family Methanomicrobiaceaeᵀ Balch and Wolfe 1981 Genus Methanoculleus Maestrojuán et al. 1990 Methanoculleus marisnigri (Romesser et al. 1981) Maestrojuán et al. 1990