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The Apicomplexa are a large group of protists, characterized by the presence of a unique organelle called an apical complex (see also apicoplast). They are unicellular, spore-forming, and exclusively parasites of animals. Motile structures such as flagella or pseudopods are absent except in certain gamete stages. This is a diverse group including organisms such as coccidia, gregarines, piroplasms, haemogregarines, and malarias; some diseases caused by apicomplexan organisms include:
