Tube worms

Ridgeia piscesae, and its relative Riftia pachyptila, are fast growing tubeworms that are symbiotic with chemoautotrophic bacteria. Lacking a mouth, gut or anus, these worms can still grow as fast as bamboo. <em>Courtesy of <a href="http://www.deepoceanquest.com/">Peter Batson</a>. Juan de Fuca Ridge, 2008</em>