Chromodoris willani reaches 5 cm. Nudibranch with pale blue to pale purple mantle with 3-4 distinctive black longitudinal lines and 2 white bands at edge (longitudinal and outer border), pale white-blue rhinophores, pale blue gills with white tip. Lives from 3 to 40 m on coral reefs of central and western Indo-Pacific. Feeds on sponges. Sought-after macro photo subject for soft colors and graphic lines. Differentiated from C. annae by multiple lines instead of one.
