Diagnostic features: Adults very large. Sucker-bearing surface of tentacular club raised off of the stalk, attached only by a thin membrane; 5 suckers in rows across the manus, median suckers enlarged; swimming keel of the club extending along stalk a distance equal to the club length. Web between arms deep: equal to half of arm length between dorsal arms, two-thirds of arm length between lateral arms, absent between ventral arms. Three flat, semicircular, flap-like papillae posterior to each eye. Fins broad. Colour: deep maroon.

References

Roper, C. F. E., M. J. Sweeney and C. E. Nauen. 1984 FAO Species Catalogue Vol 3. Cephalopods of the World: An Annotated and Illustrated Catalogue of Species of Interest to Fisheries. FAO Fisheries Synopsis 125(3).