Squid Squid Squid are cephalopods in the order Teuthida with elongated bodies, large eyes, eight arms and two tentacles. Like all other cephalopods, squid have a distinct head, bilateral symmetry, and a mantle. They are mainly soft-bodied, like octopuses, but have a small internal skeleton in the form of a rod-like gladius or pen, made of chitin. Squid can change colour for camouflage and signalling. Some species are bioluminescent, using their light for counter-illumination camouflage. Squid are members of the class Cephalopoda, subclass Coleoidea. The squid orders Myopsida and Oegopsida are in the superorder Decapodiformes (from the Greek for "ten-legged"). Two
Striped flying squid are small subcutaneous photophores on the underside of mantle, head and of the third and fourth arms, while the fourth arms have a large oval photophore at their bases and another hallway to their tips. The ventral surface of mantle has 2 stripes of luminous tissue extending along almost its entire length with two large, oval-shaped luminous patches at the end of each mantle strip closest to the head. The fins are heart-shaped and taper to a point. The larvae have dispersed large brown chromatophores while in the juveniles these are crimson and brown. The striped flying squid is distributed