A subphylum of the phylum Protozoa, characterized by the presence of spores of multicellular origin, usually with two or three valves, two or more polar filaments, and an ameboid sporoplasm; parasitic in lower vertebrates, especially common in fishes. Important genera include Ceratomyxa, Hanneguya, Leptotheca, Myxidium, and Myxobolus. [myxo- + G. sporos, seed]
