Definition: A group of three related eukaryotic phyla whose members possess an alveolar membrane system, consisting of flattened membrane-bound sacs lying beneath the outer cell membrane.
infection: coordinate IM with PROTOZOAN INFECTIONS (IM); coordinate with specific protozoan terms (ANTIGENS, PROTOZOAN, etc.) if pertinent
ExamplesApicomplexa; Ciliophora; Dinoflagellida
