Japetella diaphana tentacles and buccal cavity
Japatella diaphana is an octopus member of the Bolitaenidae family, and like the other members of its family, is very small - 12 cm long at most. They live, eat, and breed in the pelagic zone of the ocean, unlike deep-sea squid, which rarely spend their entire lives at such depths.
Mature females have a bioluminescent photophore encircling their beak.
Die Cephalopoden. Ewald Rubasmen, 1910.