Photo credit: Tracie Barry, University of Washington Tacoma
Dinophysis rotundata are small to medium sized armored dinoflagellates approximately 36-56μm long. The top of the cell (epitheca) is low and rounded. The side wing (left sulcal list) extends from one-half to three-quarters the length of the bottom portion of the cell (hypotheca). Chloroplasts are absent. Dinophysis rotundata are found in warm and cold waters. They produce dinophysistoxins and okadaic acid causing Diarrhetic Shellfish Poisoning (DSP) in humans.
For more information see: A Taxonomic Guide to Some Common Marine Phytoplankton, by Rita Horner (Biopress Ltd. 2002
SoundToxins, a diverse partnership of Washington state shellfish and finfish growers, environmental learning centers, Native tribes, and Puget Sound volunteers, is a monitoring program designed to provide early warning of harmful algal bloom events in order to minimize both human health risks and economic losses to Puget Sound fisheries.