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Phyllidia sp. 03  Genus: Cuvier, 1797

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Phyllidia sp. 03 is characterized by the pale blueish/whitish background colour, by the minute opaque white spots scattered on the mantle, giving a white granular appearance, and by the longitudinal black swirls and black patches on the mantle. The larger white tubercles are yellow capped.
This species is most likely as Phyllidia sp. 1 in Gosliner et al. (2015) at page 278, it might be as well a strange colour form of Phyllidia willani.
Pretty similar with a whitish granular appearance are:
Phyllidia ocellata which is very variable in colour, but has usually a yellow-orange ground colour of the mantle, and has large black rings,
Phyllidia babai which has a white granular appearance and black rings.
Phyllidia exquisita which has a pale bluish granular background colour, black swirls, and yellowish-orange pigment at the mantle margin
Phyllidia willani which has a white granular appearance, and lacks orange pigment at the mantle margin
I can't tell for sure how to distiguish the phyllidiids with the whitish granular appearance:
Phyllidia babai, Phyllidia exquisita, Phyllidia willani, Phyllidia sp. 01 and Phyllidia sp. 3 in IPN at page 292. I guess they are variants of one species.
Bill Rudman thinks Phyllidia babai, Phyllidia exquisita, and Phyllidia willani to be variants of the very variable Phyllidia ocellata.
More than 20 years after Brunckhorst (1993) needs the family Phyllidiidae  Rafinesque, 1814 a worldwide revision based on anatomical and molecular studies, not like the recent publication Stoffels, Bart E.M.W. et al. (2016) which focusses on the "coral triangle" and excludes most oceans.
References:
Brunckhorst, D.J. (1993) The systematics and phylogeny of Phyllidiid Nudibranchs (Doridoidea).
Records of the Australian Museum, Supplement 16: 1-107.
Gosliner, T.M, D.W. Behrens & Á.Valdés. 2015. Nudibranch &Sea Slug Identification Indo-Pacific.
New World Publications Inc. Jacksonville, FL. 408 pp.
Stoffels, B. E. M. W., van der Meij, S. E. T., Hoeksema, B. W., van Alphen, J., van Alen, T., Meyers-Muñoz, M. A., and van der Velde, G. (2016). Phylogenetic relationships within the Phyllidiidae (Opisthobranchia, Nudibranchia).
ZooKeys, (605), 1-35. Advance online publication. http://doi.org/10.3897/zookeys.605.7136
How to cite:
Köhler, E. (2017), published 30 June 2017, Phyllidia sp. 02  Genus: Cuvier, 1797
available from https://www.Philippine-Sea-Slugs.com/Nudibranchia/Euctenidiacea/Phyllidia_sp_02.htm