Okenia sp. 01  Genus: Menke, 1830

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Okenia sp. 01 has a white body with a pattern of translucent regions. The rhinophores are white with orange tips. The lateral papillae are also white with orange tips.
It is Okenia sp. 1 in
Gosliner, Terrence M., David W. Behrens & Ángel Valdés. 2008. Indo-Pacific Nudibranchs and Sea Slugs. Sea Challengers Natural History Books.
Gig Harbor, Washington. 426pp. at page 132
It was posted at these websites before as Okenia sp. A  Genus: Menke, 1830.
For some genera, such as Trinchesia is 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.