Phylum Ascomycota Caval.-Sm. (1998) - sac fungi
   Subphylum Pezizomycotina O.E. Erikss. & Winka (1997)
     Class Eurotiomycetes O.E. Erikss. & Winka (1997)
       Subclass Eurotiomycetidae Doweld (2001)
         Order Arachnomycetales Gibas, Sigler & Currah (2002)
           1 Family Arachnomycetaceae Gibas, Sigler & Currah (2002)