The Firefly Squid (Watasenia scintillans) inhabits the Western Pacific and is famously found in Toyama Bay, Japan. The 7.6cm long creatures employ bioluminescent glands in each tentacle to attract and hunt prey. Surprisingly, this is the only species of of cephalopod that is suspected of having colour vision. [Sparkling Enope Wiki via Buzzfeed – Composite Image (clockwise from left): Slutgarden, seavenger, pinktentacle]