Family Gymnodiniaceae Lankester, 1885
Family within Order Gymnodiniales. No obvious thecal plates present and cells appear to be naked or unarmored. Morphology varies but flagella usually inserted on ventral side of cell.
Genera included from this family:
Genus Cochlodinium Schütt, 1895
Genus Gymnodinium Stein, 1878
Genus Gyrodinium Kofoid and Swezy, 1921