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Flabellina bicolor (Kelaart, 1858) [Eolis]

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Flabellina bicolor is characterized by its white body and the subterminal golden band on each ceras. It has perfoliate rhinophores with golden tips and long oral tentacles with a flattened terminal lobe.
It is similar in shape to larger Flabellina riwo, including the long oral tentacles with flattened tips. It differs by the colour pattern.
One more species with that kind of oral tentacles is Flabellina bilas.
Pretty similar is Flabellina cf. bicolor, which differs by the long cerata, and by the lack of the flattened tips of the oral tentacles.
More informations on Flabellina bicolor are at Bill Rudman's Sea-Slug Forum!