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 Mucoraceae Fr. (1821)
             Genus Pirella Bainier (1882)
               Pirella circinansᵀ Bainier (1882)