Solvin Zankl / Paper nautilus (Argonauta argo) male, the males have no shell and only mate once. Deep sea species from Atlantic Ocean off Cape Verde. Captive.

GEORGETTE DOUWMA / Paper nautilus / Greater argonaut (Argonauta argo) Bali, Indonesia.

Nature Production / Greater Argonaut {Argonauta argo} feeding on small fish, captive, Japan

Nature Production / Greater Argonaut {Argonauta argo} captive, Japan