Phylum Ascomycota Caval.-Sm. (1998) - sac fungi
   Subphylum Pezizomycotina O.E. Erikss. & Winka (1997)
     Class Eurotiomycetes O.E. Erikss. & Winka (1997)
       Subclass Eurotiomycetidae Tehler ex Geiser & Lutzoni (2007), nom. inval.
         Order Arachnomycetales Gibas, Sigler & Currah (2002) [monotypic]
           Family Arachnomycetaceae Gibas, Sigler & Currah (2002)
             1 Genus Arachnomyces Massee & E.S. Salmon (1902)
             2 Genus Onychocola Sigler (1990)