[organisms] see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
   Domain "Archaea" Woese et al. 1990 stat. inval. see Domain Archaea Woese et al. 2024
     Phylum "Euryarchaeota" Garrity and Holt 2002 stat. inval. see Kingdom Methanobacteriati (Garrity and Holt 2023) Oren and Göker 2024
       Class "Methanomicrobia" Garrity et al. 2005 nom. inval.
         Order Methanomicrobiales Balch and Wolfe 1981
           Family Methanomicrobiaceae Balch and Wolfe 1981
             Genus Methanoculleus Maestrojuán et al. 1990
               1 Methanoculleus bourgensis corrig. (Ollivier et al. 1986) Maestrojuán et al. 1990
               2 Methanoculleus chikugoensis Dianou et al. 2001
               3 Methanoculleus marisnigri (Romesser et al. 1981) Maestrojuán et al. 1990
               4 Methanoculleus olentangyi (Corder et al. 1988) Maestrojuán et al. 1990
               5 Methanoculleus palmolei Zellner et al. 1998
               6 Methanoculleus submarinus Mikucki et al. 2003
               7 Methanoculleus thermophilus corrig. (Rivard and Smith 1982) Maestrojuán et al. 1990