Japanese squid

Marine cephalopod mollusc with mantle relatively small, stout, conico-cylindrical. Fins heart-shaped, about 50% of mantle length. Tentacular clubs expanded, lanceolate, the 12 enlarged medial manus suckers 2 or 3 times the diameter of marginal ones. Arms II and III enlarged, thickened, largest sucker rings large with 10 to 13 low, broad, blunt teeth; left arm IV hectocotylized in distal half to two-thirds by sucker stalks modified into papillae, most with minute, rudimentary suckers on tips; papillae of ventral row especially swollen, somewhat flattened; papillae of dorsal row more elongate, separate, conical. Maximum mantle length 12 cm.