Phoronids represent a small group of unsegmented, sedentary worm-like animals that live in tubes (Fig. 22.3!) that are often attached to the tubes of boring sea anemones, like species of Cerianthus. Superficially they resemble sabellid polychaetes but on closer examination the retractile tentacles (lophophores) are seen to be ciliated and arranged in a horseshoe shape around the mouth. They are hermaphrodites and gametes are released through their excretory ducts; the eggs drift up the tube and are trapped in the tentacles. After they have been fertilised, pelagic larvae are released into the water column and they spend several weeks in the plankton before settling and metamorphosing into adults.
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