A cephalopod mollusk of the family Argonautidae, particularly the genus Argonaut, which produces a delicate papery shell.
From Argonaut, the legendary Greek sailor, with the suffix '-id' used in zoological nomenclature. The creature was named after the mythological Argonauts.
The argonaut 'ship' is made by the female octopus from her own body secretions—it's not a shell she collects, but one she builds herself, like a living boat!
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