organisms see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
   Domain Eukaryota Chatton, 1925 - eukaryotes
     Kingdom Fungi R.T.Moore (1980) - fungi
       Phylum Ascomycota Caval.-Sm. (1998) - sac fungi
         Class Ascomycetes G.Winter (1880) see Phylum Ascomycota Caval.-Sm. (1998)
           Subclass Arthoniomycetidae see Class Arthoniomycetes O.E. Erikss. & Winka (1997)
             Order Arthoniales Henssen ex D.Hawksw. & O.E. Erikss. (1986)
               Family Arthoniaceae Rchb. (1841)
                 Genus Amazonomyces Bat. & Cavalc. (1964)
                 Genus Arthonia Ach. (1806), nom. cons.
                 Genus Cryptothecia Stirt. (1876), nom. cons.
                 Genus Eremothecella Syd. & P.Syd. (1917)
                 Genus Paradoxomyces Matzer (1996)
                 Genus Sagenidiopsis R.W. Rogers & Hafellner (1987)
                 Genus Stirtonia A.L.Sm. (1926), nom. cons.