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It is characterized by its solid whitish colour, the velar tentacles are short and thick.
The above picture was identified by Jeffrey Rosenfeld and posted on 31 May 2004 on these websites as Marionia viridescens Eliot, 1904 with my comment:
"I have to say, after checking the pictures of this species on NUDIPIXEL with the ID confirmed by experts and on Koretz' Opisthobranchs of Eilat (it was originally described from East Africa, so locality fits), that I disagree with Jeff's identification". Those pictures of Marionia viridescens Eliot, 1904 look more like Marionia sp. 11 Genus: Vayssière, 1877.
I changed it on 1 March 2016 into Marionia sp. 17 Genus: Vayssière, 1877.
Pretty similar or possibly the same species are:
Tritoniidae sp. 05, a 6 mm specimen which shows no details
Tritoniidae sp. 06 which differs by a brownish rim on the rhinophoral sheaths.
How to cite:
Köhler, E. (2016), published 1 March 2016, Marionia sp. 17 Genus: Vayssière, 1877
available from https://www.Philippine-Sea-Slugs.com/Nudibranchia/Dexiarchia/Marionia_sp_17.htm