Fig 4. Beak-to-beak mating in Larger Pacific Striped Octopus.

A) Insertion of male hectocotylized arm into female mantle cavity, male on left, female on right; B) Female (right, pale) slightly enveloping male (left) during mating; C) Sucker alignment during mating; D) sucker alignment and mantle encircled with arm during mating; E) Hectocotylus insertion during ‘distance’ mating in beak-to-beak posture (male left, female right). All photos by RLC.