Identification Key to the Phyllidiids of the Indo-Pacific Ocean
According to morphological and anatomical features
Thanks to Alexander Fahrner and Lothar A. Beck

39. Mantle margin broad and light blue. Median tubercles forming 2 ridges which converge in the region of the anus. 3 longitudinal black lines run parallel along the sides of the ridges. 2 transverse, dark bands on dorsal surface of oral tube and bulbous pharyngeus. - Phyllidia coelestis Bergh, 1905

- No light blue colouration present. Tubercles never form ridges. Dorsal pattern completely different. No dark bands on foregut. - 40