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

11. Dorsum multi-coloured; dominant colours: mustard yellow, orange, red-brown and olive. Ventral colouration mustard yellow. Medial tubercles very large, multi-compound and arranged in two rows. Rhinophores deep yellow with outer edge of lamellae olive. Digestive glands olive. - Phyllidiopsis cardinalis Bergh, 1875

- Colouration completely different, never mustard yellow, red-brown or olive. Ventral colouration grey or pale pink. Tubercles smaller and arranged differently. Rhinophores black with more or less distinct pink parts. Digestive glands pale grey, pink or brownish - 12