Argentine shortfin squid
Marine cephalopod mollusc with mantle long, muscular, widest at midpoint. Fins muscular, relatively short (length 42% of mantle length) and broad (width 57% of mantle length); fin angle broad, 45 to 55 (90 to 110° both fins), rhomboidal fins. Arms very long for the genus, averaging up to 72% of mantle length for arms close to tentacle in males; all arms of males significantly longer than in females; right (or left) arm IV hectocotylized along more than 50% of its length with suckers modified into narrow lamellae to the tip. Maximum mantle length 33 cm.