is a deep water, ghostly-looking fish that has some of the most bizarre eye structures known to science; each eye has a lateral swelling called a diverticulum, separated from the main eye by a septum. While the main part of the eye has a lens and functions in a similar way to other animal eyes, the diverticulum has a curved, composite mirror composed of many layers of what seem to be guanine crystals. This “mirror” is superior at gathering light than the normal eye; the diverticulum reflects light and focuses it onto the retina allowing the fish to see both up at down at the same time.
The spookfish is the only vertebrate known to use a mirror eye structure to see, as well as the usual lens. Spookfish are found worldwide but are rare to see, since they spend most of their lives at a depth of 1000-2000 meters. They feed on small crustaceans and plankton, and measure about 18 cm in length.
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