Phylum Dinoflagellata Engl. (1903) see Superclass Dinoflagellata Bütschli, 1885
Count: [*†*] 4c;13o;53f;257g; †1o;11f;512g [2 Mar 2016]
   Subphylum Syndinea Fensome, F.J.R. Taylor, G. Norris, Sarjeant, Wharton & G.L. Williams (1993) [monotypic]
  Count: [*] 1c;1o;4f;14g [1 Mar 2016]
     Class Syndiniophyceae A.R. Loebl. (1976) [monotypic] see Class Syndinea Chatton, 1920
    Count: [*] 1o;4f;14g [1 Mar 2016]
       Order Syndiniales A.R. Loebl. (1976)
      Count: [*] 4f;14g [1 Mar 2016]
         Family Sphaeriparaceae A.R. Loebl. (1970)
        Count: [*] 2g [1 Mar 2016]
           Genus Atlanticellodinium Cachon & Cachon-Enj. (1965) [monotypic]
          Count: -