Ceratium furca syn Peridinium furca
Size 23um base width, 250um long, total volume 3368.05, temp. range 17.85 to 29.65, salinity range 12.5 to 16.45. They are a common summer dinoflagellate and frequently bloom in the bay. See Bloom. The sample on the left came from Back River near Baltimore and the one on the right came from the Patuxent River.