DANTE FENOLIO / SCIENCE PHOTO LIBRARY DANTE FENOLIO / SCIENCE PHOTO LIBRARY
Stigmatoteuthis arcturi is a mesopelagic squid. Among its peculiarities is the fact that one eye is enormous and one much smaller. Some biologists speculate that the eyes serve different functions and the squid orients its body to use its large eye to look upward for predators and prey silhouetted by whatever light may reach it from the surface. The other eye presumably detects bioluminescence below the animal. This individual was captured in a trawl between 640 and 1000 meters depth in the Gulf of Mexico, 2007.
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