Body is irregularly segmented and divided into three regions with a dorsal ciliated groove running along its length and can be up to 9.8 in (25 cm) long; yellowish or greenish white in color. Anterior and first region is flattened on the ventral side and bears glands that secrete the tube. There are modified chaetae at the fourth chaetiger that are used to cut the tube wall. The second region of the body has winglike, modified notopodial lobes that secrete the mucus where the suspended particles are trapped. The third region is longer and distinctly segmented. Some parts of the body are phosphorescent.
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