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Platydoris formosa (Alder & Hancock, 1866) [Doris]

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Platydoris formosa has fine brown specks and large red patches. It is characterized by bright red rhinophore clubs and by distinct black lines outlining the gills. It grows up to 15 cm length.
Pretty similar are:
Platydoris cinerobranchiata
which differs by uniformly bluish-grey gills and by brownish-green rhinophores and
Platydoris cruenta which differs by its hair-like brown lines on the mantle.
More information on Platydoris formosa are on Bill Rudman's Sea-Slug Forum!