cryptomonads see Order Cryptomonadales Pascher (1913)
   reniform cryptomonads see Family Hemiselmidaceae Butcher (1967)
     1 Genus Hemiselmis M. Parke (1949)
     2 Genus Planonephros T. Christensen (1978)
     3 Genus Protochrysis A.A. Pascher (1911)