Kingdom Fungi R.T.Moore (1980) - fungi
   Phylum Mucoromycota Doweld (2001)
     Subphylum Mucoromycotina Benny (2007)
       Class Mucoromycetes Doweld (2001) [monotypic]
         Order Mucorales Nees (1817)
           Family Backusellaceae K. Voigt & P.M.Kirk (2012) [monotypic]
             Genus Backusella Hesselt. & J.J. Ellis (1969)
               Backusella circinaᵀ J.J. Ellis & Hesselt. (1969)