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Archidoris pseudoargus var. flammea
Took a bit of sleuthing, because the picture's a bit small, and it's not the regular colour variant, but I think I got the ID. This species doesn't, but apparently some of its relatives actually smell like lemon!
Is the site for the spotting wrong? because you place it inland not at the coast but this seems like a picture in the sea..unless made in an aquarium? If I know where did you spot it it may help to find an ID
Looks like a nudibranch because it has the branchs like a typical feather duster on its back and also the two little horns on the head at the top. Post it in the nudis mission. I will see if I find an ID.
Very pretty by the way :-)