Kingdom Fungi R.T.Moore (1980) - fungi
   Phylum Kickxellomycota Tedersoo, Sánchez-Ramírez, Kõljalg, Bahram, M. Döring, Schigel, T.W. May, M. Ryberg & Abarenkov (2018)
     Class Harpellomycetes Tedersoo, Sánchez-Ramírez, Kõljalg, Bahram, M. Döring, Schigel, T.W. May, M. Ryberg & Abarenkov (2018) [monotypic]
       Order Harpellales Lichtw. & Manier (1978)
         Family Legeriomycetaceae Pouzar (1972)
           Genus Smittium R.A. Poiss. (1937)
             1 Smittium arvernenseᵀ R.A. Poiss. (1937)
             2 Smittium culicis Tuzet & Manier ex Kobayasi (1969)
             3 Smittium mucronatum Manier & Mathiez ex Manier (1970)