Etang salé on a rocky coast, less 1 m, 10 December 2005
These 3 specimens have eaten about 80% of the purple sponge, frequent in this area. The sponge is probably Chelonaplysilla violacea
Chromodoris geometrica (the sibling species from the Western Pacific) also eat this sponge.
Rq : This species has a purple patch on the underside (see Alain Barrère photo) of the anterior mantle. Five other species with the same purple patch also feed on this sponge...