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paper nautilus on side.jpg
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.[1] It is used as a brood chamber and for trapped surface air to maintain buoyancy.
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- Sea Shells
![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.[1] It is used as a brood chamber and for trapped surface air to maintain buoyancy.](https://www.ruthburkeart.com/img-get2/I0000kbIbdi5RDHA/fit=1000x750/paper-nautilus-on-side.jpg)
