Aeolidia filomenae is previously confused with Aeolidia papillosa. This species occurs on coasts of the NE Atlantic Ocean from Scotland south to Portugal.
This nudibranch have a large number of slightly flattened, hooked cerata on its body and a triangular area that extends from the rhinophores to the mid dorsum. There is a white Y-shaped or V-shaped mark on the head, which can be hard to see in pale individuals.
Aeolidia filomenae feeds on a wide variety of sea anemones, usually its prey is Actinia equina and Anemonia viridis is also taken.