Cnidarians exist both as the well-known corals, jellyfish and anemones, and less well known parasitic forms. most parasitic cnidarians belong to Class Myxosporea, which includes common spore-forming parasites of fish and aquatic worms. Class Malacospore comprises several species that parasitise bryozoans (moss animals) and fish. There is a single species of Polypodium, which parasitizes salmon. |
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