Myzostomida
polychaete order
Quick Summary
Myzostomida are aberrant annelid worms that are likely related to polychaetes. These worms are parasites of echinoderms. As adults, they have a disk-shaped body with ventral parapodia, adhesive suckers, and marginal cirri. Their coelom is obscured by connective tissue, they lack a vascular system, and possess a single pair of nephridia that open into the posterior intestine. Myzostomida develop indirectly and have a typical trochophore larval stage.1
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