[3] Clione antarctica is an important component of polar ecosystems.

[4] C. antarctica has a large lipid storage capacity: up to 5% of its wet mass.

[5] It is able to survive without food for about six months by utilizing these lipid storage reserves.

[5] This species defends itself from predators by synthesizing an ichthyodeterrent (a chemical that deters fishes); this is a previously unknown molecule called pteroenone.

[6] The sea angel acts as a "guest" for the hyperiid amphipod Hyperiella dilatata, which takes advantage of the protection provided by the gastropod's icthyodeterrent.