European squid propulsion. The posterior border is slightly concave. The head is relatively small and has large eyes which are covered with a transparent membrane. Like almost all squid, this species has ten limbs surrounding the mouth and beak: eight are relatively short arms, and two, which form the tentacles, are long, as they are used to catch prey. The fourth left arm of males is a hectocotylus. The European squid can grow up to 30–40 cm in the mantle length, but more usually they are 15–25 cm long. The males are generally bigger than the females and exhibit more rapid rates
Firefly squid Firefly squid 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 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