The hectocotylus is located on arm IV, containing 10 proximity hooks, and six to 15 suckers at the tip.

They exhibit minor geographical variance, as southern specimens are slightly smaller than their northern counterparts.

[3] The species has been observed using bioluminescence to reduce its silhouette in dim surrounding light.

[4] Pyroteuthis addolux apparentlyt undergoes a diel vertical migration in which spends th day at depths of 450-500 mbefore ascending to 150-200m at night to feed, most likely on copepods and other small crustaceans.

The oocytes contained in the ovary of a sexually mature female had a length of 1.0mm, when they hatch they produce planktonic paralarva.