Argonauta

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Vampyroteuthis
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Article: "At last, scientists solve the mystery of the floating octopus"

Here's a bit of news in the popular press about Argonauta and air bubbles in the shells (already known here):
As far back as Aristotle, naturalists have wondered why the females of a strange group of octopuses sport a thin, papery shell when plenty of their tentacled cousins are essentially naked, letting all their slime hang out.
Now, observations indicate the so-called Argonaut octopus uses the outer shell to trap an air bubble, allowing her to control her buoyancy in open water and move along with ease.


To determine how female argonauts used their shells to capture air from the surface beforediving deeper in the ocean, Julian Finn, the study's lead author and a researcher at the Museum Victoria in Australia, went scuba diving with three female argonauts, caught unintentionally in Japanese fishing nets. (Male argonauts and immature females do not have shells.)
 

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