Mantle cylindrical, muscular, 18 cm in length (38 cm in full grown stage), with transversely wide, rhombic fins posteriorly. Funnel groove with faveola and lateral pockets. Funnel cartilage inverted T-shaped. Arms stout, with two rows of suckers of which horny rings with 28〜30 sharp teeth. Left or right ventral arm in male hectocotylized. Tentacle also strong, with 4 rows of suckers of which medial ones larger than marginal. Horny rings of large sucker bear sharp teeth among which those at every 90° prominently stronger than the others. Photogenic tissues in an oval patch present on the antero-dorsal mantle. Small granular photogenic tissues scattered on the ventral mantle.