|Sparkling enope squid|
The sparkling enope squid is found in the Western Pacific ocean at depths of 183 to 366 metres (600–1200 feet) and exhibits bioluminescence. Each tentacle has an organ called a photophore, which produces light. When flashed, these lights attract small fish, on which the squid can then feed.
This squid has three visual pigments located in different parts of the retina which likely allows color discrimination, each having distinct spectral sensitivities.
The sparkling enope squid measures about 3 inches (7.6 cm) long at maturity and dies after one year of life. It has the standard eight arms and two tentacles, with one pair each having three, bright light-emitting organs at the tips.
The squid spends the day at depths of several hundred metres, returning to the surface when night falls. The combination of light-sensing and light-producing organs enable it to match its underside to the brightness and colour coming from the surface (counter-illumination), making it hard for predators from below to detect it.
The firefly squid can also light up its whole body to attract a mate. The mating season lasts from March to June.
This squid is commercially fished in Japan, accounting for an annual catch of 4,804 to 6,822 tons from 1990 to 1999. 
- "Map of Life - 'Colour vision' in Firefly squid". Convergent Evolution Online. University of Cambridge. Retrieved 6 November 2012.
- Tsuchiya, Kotaro. 2007. Watasenia Ishikawa 1914. Watasenia scintillans. Version 16 June 2007 (under construction). http://tolweb.org/Watasenia_scintillans/19645/2007.06.16 in The Tree of Life Web Project, http://tolweb.org/
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