Argonauta joanneus is an extinct species of octopus assigned to the genus Argonauta.

It was described in 1915 based on fossil material from the Middle Miocene of Austria.

[1][2] It was found in fine sandy clay.

[1] The type specimen, a fossilised eggcase, measures 84 mm in diameter at its widest point but is only 18 mm thick.

This article related to the octopus is a stub.