Heterocapsa rotundatum syn. Katodinium rotundatum, Massarita rotundatum, Amphidinium rotundatum, Gymnodinium minutum, Amphidinium pelucidum, Amphidinium redekei, Marssarita rotundatum
var. conradi, Katodinium minutum
Size 6.5um base width, 10.4um long, total volume 115.03. Temp. range 8.56 to 28.68, salinity range 8.8 to 17.06. Collected October through May from all Rhode River stations and in the Chesapeake Bay. Photo of an intense bloom on right is in a bucket collected off the SERC dock from the Rhode River. The dark circular areas are the cells coming up and clustering toward the light in the room.