 Type D exhibits large, spherical areolation in the thecal surface with pores in the center of every 3-5 areolae; type E is characteristic of laterally flattened "Dinophysis" and consists of a circular areolation thecal surface and a central pore in nearly all areolae.Minute, usually rod-shaped or granular and yellow or brown colored chloroplasts are characteristic of "Dinophysis".The chloroplasts have stacks of three thylakoids and an internal pyrenoid.