The funnel is embedded in head tissue. The hectocotylus detaches at mating. Characteristics Arms Suckers mostly in two series but grade to single series near mouth. Extensive web between all arms. Short, broad Funnel-locking apparatus Lateral folds on the funnel and corresponding grooves on the mantle.
Water pores Absent.
As in all argonautoids, the male has its hectocotylus coiled in a sac. In Haliphron this is located beneath the right eye and due to the thick gelatinous tissue on the octopod, it is easily overlooked. The photograph on the left shows the oral view of a male with only seven arms visible. A large, brooding female was observed from a submersible off Hawaii at 270 m. The female was badly damaged as can be seen by the truncated dorsal arms and the crease in one of the lower arms.