Fig. 11. Melanophore and iridophore patterns in tester duchamp mutant hybrids. (A,B) Different illumination of the same fields of view reveals melanophore organization (A,C) and iridophore organization (B,D). (A,B) Tester duchamp hybrids for D. dangila exhibit clusters of melanophores (arrows) with iridophores (arrowheads) organized around these clusters, as for hybrids of the D. rerio species group. (C,D) Tester duchamp hybrids for D. albolineatus typically do not form clusters of melanophores (arrows), and iridophores (arrowheads) are poorly organized. Scale bars: in A, 200 µm for A,B; in C, 200 µm for C,D.