November 24, 1999
From: Erwin Koehler
I think this is Phyllidiella rudmani (Brunckhorst, 1993). It is from Balicasag Is., Philippines, Nov. 1998
Medslugs.Koehler@t-online.deKoehler, E., 1999 (Nov 24) Phyllidiella granulata from Philippines. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/1471
I am not a great expert on P. rudmani, even though it's named after me, but I don't think your photo is this species. From Brunckhorst's description it can be distinguished externally by the pinkish mantle colour, only two black lines on the mantle, which run longitudinally, and rhinophore clubs that have a black upper half and a pink lower half. Your animal looks quite like Phyllidiella lizae in apparently having some transverse black lines but that species also has black and pink rhinophores.
I think your animal is Phyllidiella granulata which has a greyish mantle and black tapering rhinophore clubs.
I must say when Dave Brunckhorst first sorted these animals out I wondered whether some of the species he separated out were just colour variations, but after being forced to look at the differences more carefully to answer queries like yours, I am beginning to see the value of his distinctions.