Martialia hyadesii is a species of flying squid commonly known as the sevenstar flying squid.

They have a maximum mantle length of 400mm, with a body weighing 820g.

M. hyadesii occurs in epipelagic and mesopelagic waters of the Southern Ocean.

Its range may be circumpolar with a Sub-Antarctic distribution.

[2] These large squid are known to prey upon deep-sea ridgeheads and other mesopelagic fish, and to be preyed upon in turn by seals, king penguins and albatrosses.