Members of the kingdom Dinoflagellata are single-celled, have a long whip-like flagellum, and are encased in a shell or test. They are mostly marine, forming an important part of the plankton. Some photosynthesize and many of these form symbiotic relationships with corals, anemones and clams. Under certain conditions, dinoflagellates can multiply prodigiously and cause "blooms". Some produce powerful toxins that can be poisonous to marine organisms, affecting humans when, for example, shellfish are consumed.
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- Introduction to the Dinoflagellata Includes sections on the fossil record, life history and ecology, systematics, and morphology.
- Dinoflagellate-L Forum for discussion related to modern and fossil dinoflagellates, such as culturing, toxicology, red tides, taxonomy, systematics, evolution, ecology, palaeoecology, physiology, stratigraphic interpretation, and palaeoclimatology.
- Dinoflagellates Information on these organisms including their fossil record, classification, biology and life cycle with a number of images of individual species.
- Dinoflagellates Article by Jean-Marie Cavanihac with much information on these organisms which can cause blooms in the ocean, with several photographs.