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Jorunna sp. 05  Genus: Bergh, 1876

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This species is on Bill Rudman's Sea-Slug Forum as Jorunna sp. 2, it might be as well a strange variant of the highly variable Jorunna parva (Baba, 1938). Here are 168 pictures of it from Japan, though some might be misidentified (the webmaster K. Akasaka is no scientist, there are many wrong IDs on the umiushi-zukan website, but refuses to change the errors).
I label it for now Jorunna sp. 05, to distinguish it from other undescribed species of the genus Jorunna  Bergh, 1876.
Jorunna sp. 05 is usually yellow with black spots, in some cases it can have a white background colour, and sometimes the black patches are replaced by scattered black caryophyllidia all over the mantle. Distinctive is a large black spot or line on the posterior tip of the foot, which the above specimen lacks.
More reseach is needed to to confirm the widespred Indo-Pacific distribution of these variants.
More information on Jorunna sp. 05 as Jorunna sp. 2 are on Bill Rudman's Sea-Slug Forum!