Another spherical photophore is located at the base of the tentacular club.

The fourth right arm is hectocotylised and has 13-19 basal hooks, each of these hooks is large and has a primary cusp with a smooth inner edge and a large, rounded secondary cusp.

Betong these basal hooks there is a fleshy, elongated pad, this is a flap in other species of Pyroteuthis, with three hooks opposite it and between zero and thirteen suckers at its tip.

[3] P. margaritifera has been collected off Bermuda from depths of 375–500 m in the day and between 75 and 175 m during the night.

It was originally described by the German naturalist Eduard Rüppell in 1844 as Enoploteuthis margaritifera from specimens taken in the Mediterranean.