Natura - nature
   actualia - actual entities
     Mundus Plinius - physical world
       naturalia - natural bodies
         Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
           Domain Bacteria Woese et al. 2024
             Kingdom Pseudomonadati (Gibbons and Murray 1978) Oren and Göker 2024
               Phylum Pseudomonadotaᵀ Garrity et al. 2021
                 Class Deltaproteobacteria Kuever et al. 2006
                   Order Myxococcalesᵀ Tchan et al. 1948 (Approved Lists 1980)
                     Family Archangiaceae Jahn 1924 (Approved Lists 1980)
                       Genus Melittangium Jahn 1924 (Approved Lists 1980)
                         1 Melittangium alboraceum (Peterson 1959) McCurdy 1971 (Approved Lists 1980)
                         2 Melittangium boletusᵀ Jahn 1924 (Approved Lists 1980)
                         3 Melittangium lichenicola (Thaxter 1892) McCurdy 1971 (Approved Lists 1980)