Phylum Ascomycota Caval.-Sm. (1998) - sac fungi
   Subphylum Pezizomycotina O.E. Erikss. & Winka (1997)
     Class Dothideomycetes O.E. Erikss. & Winka (1997)
       Order Microthyriales G. Arnaud (1918), incertae sedis [monotypic]
         Family Microthyriaceae Sacc. (1883)
           1 Genus Arnaudiella Petr. (1927)
           2 Genus Calothyriopsis Höhn. (1919)
           3 Genus Caribaeomyces Cif. (1962)
           4 Genus Chaetothyriothecium Hongsanan & K.D.Hyde (2014)
           5 Genus Hansfordiella S.Hughes (1951)
           6 Genus Microthyrium Desm. (1841)
           7 Genus Palawania Syd. & P.Syd. (1914)
           8 Genus Seynesiella G. Arnaud (1918)
           9 Genus Tumidispora Hongsanan & K.D.Hyde (2015)