Interesting nudi found under a rock. I think it was on some kind of sponge, which I foolishly failed to photogrtaph. Pretty sure it's Goniodoris. Maybe Goniodoris meracula?
This species of pleurobranch varies widely in color: from pale, nearly white, to a deep brown that's almost black (as in this observation). B. martensi can autotomize parts of its mantle when threatened. It feeds on sponges.
12mm length
5m depth
Saw 4 of these, all around this size or smaller.
Time! and find of the week! so excite to see this little pink blob swaying on its weed.
Whenever I have seen them they have been in difficult positions to photograph