Photo credit: Lyndsey Claassen, WSG
Protoperidinium steinii are small to medium sized dinoflagellates, approximately 39-60μm long and 22-44μm wide. These pear-shaped cells have a horn on the epitheca, while its hypotheca has two spines. P. steinii are cosmopolitan.
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.