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The term "Oweniida" refers to an order within the class Polychaeta, which are marine worms. These worms are typically sedentary and have a dwelling tube made of mucoid material, often coated with sand or shell fragments. Their size ranges from 0.2 to 10 cm, and they include genera such as Owenia. Polychaetes themselves are segmented worms belonging to the phylum Annelida, characterized by paired lateral appendages called parapodia that bear setae.1

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