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This specimen was identified by Dr. Juan Lucas Cervera Currado, thanks a lot!
'Montereina' rubra (Bergh, 1905) [Discodoris] was originally posted at these websites as Discodoris rubra Bergh, 1905 I place it in the genus "Montereina" according to:
Dayrat, B. 2010. A Monographic Revision of Basal Discodorid Sea Slugs (Mollusca: Gastropoda: Nudibranchia: Doridina). Proceedings of the California Academy of Sciences 61, suppl I: 1-403.
More information on 'Montereina' rubra as Peltodoris rubra are on Bill Rudman's Sea-Slug Forum!