Watasenia scintillans

The firefly squid (Watasenia scintillans), also known as the sparkling enope squid, is a species of squid in the family Enoploteuthidae. It is the sole species in the monotypic genus Watasenia. The firefly squid is found in the Western Pacific Ocean at depths of 183 to 366 metres (600–1200 feet) and is bioluminescent. The mantle, head, arms and tentacles are dotted with tiny, light-producing organs called photophores. When flashed, the light attracts small fish, which the squid can feed upon. This squid has three visual pigments located in different parts of the retina which likely allows color discrimination, each having distinct spectral sensitivities.