The dinoflagellates are single-cell, mostly marine, organisms with a weird and wonderful external appearance. The cells are biflagellate with one flagellum in an equatorial groove around the cell, and another starting at the same point and passing down a longitutindal groove before it extends into the surrounding water.
Dinoflagellates are most typical of warm waters and can reproduce in staggering numbers.
Contaminated shell fish are dangerous to humans. Some dinoflagellates are photoluminescent and if disturbed, the organism produces a series of bright flashes. Algoa Bay Dinoflagellates . Although this site is about South African and deals with dinoflagellates of southern Africa, the collection of photographs will given you a flavor for the diversity of the dinoflagellates. Introduction to the Dinoflagellata .