Thordisa villosa (Alder & Hancock, 1864) [Doris]

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Thordisa villosa is characterized by a translucent yellowish body, and by a pattern of dark brown patches around the mantle edge. The rhinophore clubs are brownish to orange, and have in some specimens translucent white tips. The gills are translucent brownish-grey with white edgings.The dorsum is tuberculate and some of the larger tubercles have a long tapering fluid filled papillae.
Very similar is Dendrodoris atromaculata (Alder & Hancock, 1864) [Doridopsis], I don't know how to distinguish them.
The identification of the specimen at the pictures #2 and #3 was confirmed by Dr. Richard Willan:"...is a perfectly typical Thordisa villosa. No doubt or problem there."
More information on Thordisa villosa are on Bill Rudman's Sea-Slug Forum!