Argonauts

The argonauts (genus Argonauta, the only extant genus in the family Argonautidae) are a group of pelagic octopi. They are also called paper nautiluses, referring to the paper-thin eggcase that females secrete. This structure lacks the gas-filled chambers present in chambered nautilus shells and is not a true cephalopod shell, but rather an evolutionary innovation unique to the genus Argonauta. It is used as a brood chamber and for trapped surface air to maintain buoyancy. For more information visit the Wikipedia Entry Get back to Cephalopoda

Greater Argonaut

Winged Argonaut