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In page Marine worm:

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Marine worms can be herbivores, carnivores, parasites, detritivores, or filter feeders, but many strange examples of feeding are seen in this diverse type of animal. The group of Siboglinidae have developed a relationship with symbiotic bacteria within their gut that often perform chemosynthesis from which the worm benefits. These bacteria reside in a specialized organ called the Trophosome.[1] Some worms have an extendable pharynx or a proboscis for consuming prey, while others have developed jaws.[citation needed]