A group of microscopic parasitic organisms found in fish and other aquatic animals, related to the myxozoans.
From actino- (ray-shaped) + myxo- (mucus, slime) + -idia (plural suffix for small organisms). These creatures produce spore-like structures that release mucus-like substances.
Actinomyxidians are so weird that scientists long debated whether they were animals, plants, or something entirely different—it took modern genetics to prove they're actually related to jellyfish!
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