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Plocamopherus cf. tilesii  Bergh, 1877

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cf. is an abbreviation from a Latin word (confer) and means 'refer to' or 'compare with', here it means it could possibly be Plocamopherus tilesii or perhaps something closely related, or at least similar in appearance.
Plocamopherus cf. tilesii is characterized by its translucent body, covered with brown and yellow spots. Distinctive are the long, branched whitish velar appendages, the rhinophores: transcendent with a white median core and an orange core in the outer third, and the series of yellowish spots at the margin of the oral veil. It differs from other members of the genus Plocamopherus by the number of lateral appendages, it has only one pair of lateral appendages just behind the gills. There is a prominent median crest behind the gills with minute white spots giving the appearance of a white median line.
My best guess was on 02 September 2012 the family Polyceridae Alder & Hancock, 1845, with the subfamily Triophinae Odhner in Franc, 1968, I posted it as Polyceridae sp. 01.
the above 2-4 mm specimen looks somehow similar to a picture of Plocamopherus tilesii Bergh, 1877 from Anilao at Nudi Pixel.
I found a picture of the same species from Tahiti, I was wondering before if the above 2-4 mm specimen might be a juvenile Plocamopherus tilesii, but the specimen from Tahiti is 4 cm long, I changed it on 05 September 2012 into Plocamopherus cf. tilesii  Bergh, 1877.
Let me quote IPN on Plocamopherus tilesii at page 106: "Translucent yellowish body color, homogenously speckled with regular black and white spots. Oral veil margin yellow with black oral tentacles. Three pairs of short lateral appendages, with the last two pairs having a prominent white global structure." Reference:
Gosliner, Terrence M., David W. Behrens & Ángel Valdés. 2008. Indo-Pacific Nudibranchs and Sea Slugs. Sea Challengers Natural History Books.
Gig Harbor, Washington. 426pp.
Plocamopherus cf. tilesii differs from Plocamopherus tilesii by the transcendent body colour, covered with brown and yellow spots, by the long branched whitish velar appendages, by the colour of the rhinophores: transcendent with a white median core and an orange core in the outer third, and by the number of pairs of lateral appendages: 3 in Plocamopherus tilesii only one pair just behind the gills in Plocamopherus cf. tilesii.