Hypselodoris Apolegma

Size: Up to 70 mm
Range: Western Pacific; recorded from the Philippines, Indonesia, Malaysia, and parts of Papua New Guinea
Habitat / Depth: Coral reefs and rocky reef slopes, typically found at depths of 5–40 m
Diet: Feeds on sponges, especially species in the family Halichondriidae

Image taken by Fisheye Underwater Productions
in El Nido, Palawan.