[organisms] see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
   Domain "Archaea" Woese et al. 1990
     Phylum "Euryarchaeota" Garrity and Holt 2001
       Class "Methanomicrobia"
         Order Methanomicrobiales Balch and Wolfe 1981
           Family Methanospirillaceae Boone et al. 2002
             Genus Methanospirillum Ferry et al. 1974 (Approved Lists 1980)
               Methanospirillum hungatei corrig. Ferry et al. 1974 (Approved Lists 1980)