Division Dinoflagellata Engl. (1903) see Superclass Dinoflagellata Bütschli, 1885
   Subdivision Syndinia [monotypic]
     Class Syndiniophyceae A.R. Loebl. (1976) [monotypic] see Class Syndinea Chatton, 1920
       Order Syndiniales A.R. Loebl. (1976)
         1 Family Amoebophryaceae Cachon ex A.R. Loebl. (1970) [monotypic]
         2 Family Duboscquellaceae Chatton ex A.R. Loebl. (1970)
         3 Family Sphaeriparaceae A.R. Loebl. (1970)
         4 Family Syndiniaceae Chatton (1920)
         5 Genus Atelodinium Chatton (1920), incertae sedis see Genus Syndinium Chatton (1910)
         6 Genus Coccidinium Chatton & Biecheler (1934), incertae sedis