Opalescent inshore squid

Marine cephalopod mollusc whose mantle measures 19 cm in males and 17 cm on females. It has 8 short arms and 2 longer tentacles. All equipped with two rows of cup-shaped suction cups with blunt teeth in the center. The left ventral arm of the male squid is hectocotolized, so that the last third of the arm considerably reduces suction cups, modified for reproductive purposes. It has a pair of triangular fins that extend from the tip to almost half the mantle. They have chromatophores on their skin to change their color. They are normally a bluish-white to mottled brown and gold, and they change to dark red or brown when excited, frightened or feeding.