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

38. White or blue-grey tubercles, capped in yellow, rounded, very numerous, isolated or coalesced at their bases. Ventral surface dark grey. Oral tube with 1 or 2 longitudinal black lines on dorsal side. - Phyllidia tula Er. Marcus & Ev. Marcus, 1970

- Tubercles white, capped in yellow, less numerous and always isolated, large conical and small rounded tubercles alternate. Ventral surface pale grey. Oral tube with indistinct transverse, grey band on posterior dorsal surface. - Phyllidia carlsonhoffi Brunckhorst 1993