Gymnodiniales

order of athecate dinoflagellates Gymnodiniales (Gymnodiniales) is an order comprising closely related families of organisms. It contains 7 families with 47 known species. Key family groups include Brachidiniaceae, Gymnodiniaceae, Hemidiniaceae, Kareniaceae, Polykrikaceae, and Tovelliaceae. It belongs to Dinophyceae (Dinophyceae).