A small floating octopus, the female of which has webbed sail-like arms and secretes a thin coiled papery shell in which the eggs are laid. Also called paper nautilus.
- Genus Argonauta, order Octopoda
- The coleoids include modern squids, cuttlefish, octopuses, and the argonauts or paper-nautilus, together with extinct groups such as the belemnites.
- These ammoniac egg cases/brood chambers closely resemble the female Argonauta shell, produced for this purpose by the adult argonaut.
- One of the most astounding cephalopods is the paper nautilus also known as argonaut.
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