Domain Eucaryota
   Subdomain Chlorota Doweld (2001)
     Kingdom Peridiniobiota Starobogatov ex Doweld (2001)
       Subkingdom Peridiniobiotina Doweld (2001)
         Phylum Peridiniophyta Engl. (1909)
           Subphylum Syndiniophytina Fensome, Taylor, Norris, Sarjeant, Wharton & Williams (1993) [monotypic]
             1 Class Syndiniophyceae A.R. Loebl. (1976) see Class Syndinea Chatton, 1920