Photo credit: Gabriela Hannach, King County Environmental Lab
Chaetoceros socialis are small diatoms joined in petite, bendable chains. They are 4-15µm wide with their hair-like setae coming from the inside corners of the cell. C. socialis are generally found in a spherical shape.
Chaetoceros socialis are cosmopolitan.
For more information on Chaetoceros 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.