Goniodoridella sp. 05  Genus: Pruvot-Fol, 1933

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Goniodoridella sp.05 is characterized by its whitish body, scattered with brownish-black spots, looking like a crescent just behind the rhinophores. The rhinophores, the gills, and the extrabranchial processes are translucent white. The picture of this approximately 1-2 mm specimen is a cutout of the original picture.
It is most probably Goniodoridella sp. 7 in IPN at page 128:
Gosliner, Terrence M., David W. Behrens & Ángel Valdés. 2008. Indo-Pacific Nudibranchs and Sea Slugs. Sea Challengers Natural History Books.
Gig Harbor, Washington. 426pp.,
though it seems to lack the median black patch in front of the rhinophores.
Pretty similiar is:
Goniodoridella sp. 01 which differs by the black line running down from the 'crescent' at the sides in a posterior slant.