(1) These ammoniac egg cases/brood chambers closely resemble the female Argonauta shell, produced for this purpose by the adult argonaut .(2) One of the most astounding cephalopods is the paper nautilus also known as argonaut .(3) The coleoids include modern squids, cuttlefish, octopuses, and the argonauts or paper-nautilus, together with extinct groups such as the belemnites.