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BiologyFound in rocky areas, from the intertidal to 49 m (Ref. 2850). Sleeps on the oral disc, leaving the anemone (Urticina lofotensis) by day but returning every night (Ref. 45560). Commonly encountered hovering motionless by divers (Ref. 2850). Feeds on crustaceans, polychaetes, small mollusks and bryozoans (Ref. 4930). Neither anterolateral glandular grooves nor venom gland is present (Ref. 57406).