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Figure 4


Fig. 4. Remodeling of skull bone during flounder metamorphosis as visualized by calcein. The most dramatic changes that take place are asymmetric condensation and deformation of the frontal (left frontal bone, closed arrow) and parietal bones (left and right parietal bones, LP, RP) (A-F), and the formation of the pseudomesial bar (above broken line) and elongated right lateral ethmoid. (A-F) Frontal views; (A'-F') right saggital views; (A''-F'') left saggital views; (A,A'') early pre-metamorphosis, 12 d.p.f.; (B,B'') late pre-metamorphosis, 16 d.p.f.; (C,C'') pro-metamorphosis, 20 d.p.f.; (D,D'') early metamorphic climax, 22 d.p.f.; (E,E'') late metamorphic climax, 24 d.p.f.; (F,F'') post-metamorphic juvenile, 26 d.p.f.. Dorsal fin (open arrow), right lateral ethmoid (white arrowhead), anterior parietal barb (black arrowhead) pseudomesial bar (above broken line). Bars, 0.2 mm.