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It is Trapania sp. 5 in IPN:
Gosliner, Terrence M., David W. Behrens & Ángel Valdés. 2008. Indo-Pacific Nudibranchs and Sea Slugs. Sea Challengers Natural History Books.
Gig Harbor, Washington. 426pp. on page 139
In this specimen are the white patches very large, it might be a distinct species.
It was posted on 06 Aug. 2008 at these websites as Trapania sp. A Genus: Pruvot-Fol, 1931,
for some genera, such as Trinchesia was the alphabet almost through. I had to change the distinguishing alphabetic character into a number. I have chosen 2-digit numbers, even though '01' looks a little bit stupid, and now is only the genus italic written.