Spintherida

polychaete order

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In annelid: Annotated classification
Order Spintherida Body oval; median antenna on prostomium; pharynx retractable; dorsal surface with membranous ridges; ventral setae strongly curved; found on sponges; small; single genus, Spinther. Order Phyllodocida Free-moving; a large group characterized by a protrusible proboscis that may or may not be armed with
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