Class Cryptophyceae Pascher ex Schoenichen (1925) see Class Cryptophyceae F.E. Fritsch (1927)
   Order Cryptomonadales Pascher (1913)
     Family Hemiselmidaceae Butcher (1967)
       Genus Hemiselmis M. Parke (1949)
         Subgenus Hemiselmis subg. Hemiselmis (M. Parke, 1949) Butcher (1967)