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The split eyes of the whirligig beetle Gyrinus sp. (a), (b), Top (a) and bottom (b) view of the head of Gyrinus sp. under a light microscope shows the overwater and the underwater eyes, respectively. (c), 3D-reconstruction of a lateral view of a Gyrinus beetle head taken by a fluorescent microscope; the overwater part is left and the underwater part is right.
