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Phyllidia cf. exquisita differs from Phyllidia exquisita by too much black, not only black swirls, and it lacks the yellowish-orange line at the anterior mantle margin.
Pretty similar 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 black rings at the base of some tubercles, and has a pale yellow mantle margin in some specimens,
Phyllidia coelestis which has lots of small tubercles on the mantle’s flanks and white granules are never visible in the pale areas,
Phyllidia willani which has longitudinal black swirls and a white granular appearance, and lacks orange pigment at the mantle margin
Phyllidia sp. 01 which has a pale yellowish-orange background colour
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 revision based on anatomical and molecular studies.
Brunckhorst, D.J. (1993) The systematics and phylogeny of Phyllidiid Nudibranchs (Doridoidea).
Records of the Australian Museum, Supplement 16: 1-107.
More information on Phyllidia exquisita are on Bill Rudman's Sea-Slug Forum!
How to cite:
Köhler, E. (2017), published 1 August 2017, Phyllidia cf. exquisita Brunckhorst, 1993
available from https://www.Philippine-Sea-Slugs.com/Nudibranchia/Doridina/Phyllidia_exquisita_cf.htm