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The name of this species 'parangatum' is derived from the Filipino words parang gatas referring to the milky colour of the living animals.
Pretty similar is:
Phyllodesmium magnum which is a larger species, up to 130 mm length, and has more flattened brownish cerata, often with a bluish tinge and yellowish apices. It differs also by the position of the anal papilla. Let me quote IPN: "There are also major internal differences in the form of the radula and jaws."
Gosliner, Terrence M., David W. Behrens & Ángel Valdés. 2008. Indo-Pacific Nudibranchs and Sea Slugs.
Sea Challengers Natural History Books. Gig Harbor, Washington. 426pp.
How to cite:
Köhler, E. (2018), published 17 May 2018, Phyllodesmium parangatum Ortiz & Gosliner, 2003
available from https://www.Philippine-Sea-Slugs.com/Nudibranchia/Cladobranchia/Phyllodesmium_parangatum.htm