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The Yeti Crab, K. puravida, discovered in 2006, lives in methane seeping fissures 3,300' deep and has recently been shown to harvest bacteria which live on their hairy arms and eat them.
Rosy Acorn Worm is a new species of acorn worm discovered some 8,850 feet (2,700 meters) deep near the Mid-Atlantic Ridge. Deepwater worms have extremely long 'lips', helping them snag prey in a place where food is scarce. via nationalgeographic