A taxonomic order of parasitic organisms related to jellyfish and corals, typically found infecting fish and invertebrates.
From actinomyxidia + -ida (taxonomic order suffix). Part of the scientific naming system that groups related organisms at the ordinal level.
This order is so poorly understood that new species are still being discovered regularly, and scientists suspect we've only found a tiny fraction of the thousands that probably exist in Earth's oceans.
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