A colonial sedentary tube fanworm with a C-shaped pale/white crown of <200 tentacles (radioles). Radioles arranged in interlocking spirals or whorls, usually with one or more paired composite eyes scattered on their outer surface. Tube composed of mud/silt-mucoid outer layer. Trunk of body greenish or purplish brown. The fan usually retracts into tube when approached. The opening of the tube is then 'pinched' at the middle.
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