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It was me who suggested the possibility of this belonging to the species P. mediterranea, but I told Miguel that I couldn't be sure because it is not possible to see the ventral side of the radial node. So I told Miguel to put the pictures here. I don't know if it is possible to know the species from the pictures. I guess it is more likelly that it belongs to the species you mentioned Nikita, I don't know how rare P. mediterranea is. :)