Cephalopod eight or ten. Decapods such as cuttlefish and squid have five pairs. The longer two, termed "tentacles", are actively involved in capturing prey; they can lengthen rapidly (in as little as 15 milliseconds). In giant squid they may reach a length of 8 metres. They may terminate in a broadened, sucker-coated club. The shorter four pairs are termed "arms", and are involved in holding and manipulating the captured organism. They too have suckers, on the side closest to the mouth; these help to hold onto the prey. Octopods only have four pairs of sucker-coated arms, as the name suggests, though
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