[organisms] see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
   Domain "Archaea" Woese et al. 1990
     Phylum "Crenarchaeota" Garrity and Holt 2001
       Class Thermoprotei Reysenbach 2002
         Order Sulfolobales Stetter 1989
           Family Sulfolobaceae Stetter 1989
             Genus Acidianus Segerer et al. 1986
               1 Acidianus infernus Segerer et al. 1986
               2 Acidianus ambivalens (Zillig and Böck 1987) Fuchs et al. 1996
               3 Acidianus brierleyi (Zillig et al. 1980) Segerer et al. 1986