Several dinoflagellate species in the genus Dinophysis produce potent lipophilic toxins (okadaic acid, and its derivatives the dinophysistoxins and pectenotoxins), which cause diarrhetic shellfish poisoning. Photo taken during MERHAB taxonomy course and provided by Cindy Heil

Dinophysis acuminata (D. Anderson)

Dinophysis bloom in Norway (E. Dahl)

Dinophysis norvegica , C. Heil

The Imaging FlowCytobot captured this image of the toxic alga Dinophysis acuminata during the bloom in March 2008. (H. Sosik and R. Olson, WHOI, and L. Campbell, Texas A&M)

Dinophysis and other dinoflagellates (D. Anderson)