Mantle oblong and the Posterior gland and gland pore reddish pigmented. Arm suckers tetraserial. Hectocotylus present on left ventral arm: 10 rows of reduced suckers proximally. Club with 12 to 24 suckers in transverse rows (very variable depending upon geographic area). Swimming keel of club slightly shorter than carpus; dorsal and ventral protective membranes not joined at base of club; extend proximal to carpus along stalk as low ridges.