Thordisa oliva  Chan & Gosliner, 2007

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Thordisa oliva is characterized by its brownish-green body colour decorated with elongate translucent papillae. The rhinophores are translucent with an opaque white apex, or uniformly white, the gills are pale tan or white.
The identification of this specimen was confirmed by David W. Behrens, thanks!
It was originally posted at these websites as Discodorididae sp. A Family: Bergh, 1891
Gosliner, Terrence M., David W. Behrens & Ángel Valdés. 2008. Indo-Pacific Nudibranchs and Sea Slugs. Sea Challengers Natural History Books.
Gig Harbor, Washington. 426pp.
IPN writes at page 171: "Known from tropical South Africa and the Kerama Islands of southern Japan."