All four families of the Argonautoidea are pelagic although one (Alloposidae) is "associated" with the ocean floor. The families are primarily distinguished by an unusual means of copulation which involves transferring a detached hectocotylus from the male to the female. The clade includes gelatinous species as well as very muscular species.
An incirrate octopod ...
- with detachable hectocotylus.
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