Extensive beds of siboglinid polychaetes provide a habitat for many animals.  These siboglinids have lost both their mouth and anus and live off of energy which symbiotic bacteria provide.

Extensive beds of siboglinid polychaetes (beard worms) provide a habitat for many animals. Through evolution, these siboglinids have lost both their mouth and anus; they live on the energy which symbiotic bacteria provide. Photo courtesy of CRROCKS/NSF.

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