Left image: P. gracile; Right image: P. micans
Photo credits: Brian Bill, NOAA
Prorocentrum are small to medium sized dinoflagellates with a theca (shell) made up of two lateral plates. The two species of Prorocentrum vary in shape- teardrop shaped with a rounded end (P. gracile) or a broad leaf shaped with a pointed end (P. micans,). Both have a small spine present on the anterior. Chloroplasts are present.
Prorocentrum are found in temperate to tropical waters.
For more information on Prorocentrum 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 American 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.