In the depths of the Atlantic Ocean, researchers recently discovered, dozens of rare species proliferate. Hidden within the craggy under-sea peaks and large, dark valleys, strange creatures thrive in spite of the darkness and lack of food. Among them are several rarely seen elsewhere -- more than 10 potential new species -- and even an odd creature that may be a "missing link" between vertebrate and invertebrate life.
This enteropneust, or "acorn," worm feeds on sea floor sediment leaving behind curling, wavy, tracks.
Do you have comments on this slideshow? Leave them here.
Image credit: Courtesy of David Shale