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

47. Mantle margin with white or blue-grey semicircles (with smaller, yellow capped tubercles) and with yellow-orange edge, interrupted by black rays. Rhinophores with15-17 lamellae. Tubercles capped in dark yellow-orange. Visceral envelope entirely dark grey. - Phyllidia rueppelii (Bergh, 1869)

- Mantle margin with numerous small, white tubercles. Semicircles and yellow-orange edge absent. Rhinophores with 18-20 lamellae. Tubercles capped in very pale yellow. Anterior region of the grey visceral envelope pale and translucent. - Phyllidia guamensis (Brunckhorst, 1993)