The porcupine-worms (Family Euphrosinidae) are closely related to the more famous tropical fireworms (Family Amphinomidae). Fireworms have fragile chaetae (calcareous bristles) that when broken can lodge under the skin, causing considerable pain from an associated neurotoxin infection. The more benign porcupine-worms, however, apparently do not produce such secretions. Porcupine-worms are known to be carnivorous and have been reported to feed on sponges, bryozoans and coral. Relatively little information is available on the biology of porcupine-worms, especially those living in cold water.

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