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What are Mesozoans?

Mesozoans are small parasitic worms that have a relatively simple body structure - but very complicated life cycles.


Mesozoans parasitize and absorb nutrients from the body tissues and internal cavities of marine invertebrates. Some have been found living in flatworms, nematode worms, polychaetes, bivalve molluscs, brittle stars and other groups such as squid, cuttlefish and octopus.