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 Halobacteria Grant et al. 2002 [monotypic]
                   Order Haloferacales Gupta et al. 2015 [monotypic]
                     Family Haloferacaceaeᵀ Gupta et al. 2015
                       Genus Haloferaxᵀ Torreblanca et al. 1986
                         01 Haloferax alexandrinus Asker and Ohta 2002
                         02 Haloferax chudinovii Saralov et al. 2014
                         03 Haloferax denitrificans (Tomlinson et al. 1986) Tindall et al. 1989
                         04 Haloferax elongans Allen et al. 2008
                         05 Haloferax gibbonsii Juez et al. 1986
                         06 Haloferax larsenii Xu et al. 2007
                         07 Haloferax lucentense corrig. Gutierrez et al. 2004
                         08 Haloferax mediterranei (Rodriguez-Valera et al. 1983) Torreblanca et al. 1987
                         09 Haloferax mucosum Allen et al. 2008
                         10 Haloferax prahovense Enache et al. 2007
                         11 Haloferax sulfurifontis Elshahed et al. 2004
                         12 Haloferax volcaniiᵀ (Mullakhanbhai and Larsen 1975) Torreblanca et al. 1986