Researchers found this six-inch squid, called Histioteuthis
sp., at about 1,000 meters (3,000 feet), where almost no
sunlight penetrates. Adapted to midwater life, it has spots that let it change color (chromatophores), light-producing
organs, and two different-sized eyes. WHOI scientists took part in a voyage
in April 2006 to sample animal plankton such as this and sequence
their genes at sea to "barcode" them for future identification.
(Photo by Laurence Madin, Woods Hole Oceanographic Institution)