Fig. 10. Differential sensitivities across danios to melanophore reduction during hybrid pigment pattern development. An abbreviated phylogeny is shown on the left and wild-type danio pigment patterns are shown in A,C,E,G,I,K,M. Representative duchamp mutant hybrids are shown in B,D,F,H,J,L,N; schematics illustrate melanophore distributions (dorsal scale-associated melanophores are omitted for clarity). (A,B) Heterozygous duchamp mutant D. rerio (B) exhibit spots and fewer melanophores than wild type (A). Xanthophore and iridophore deficits are not apparent. (C,D) duchamp hybrids for D. kyathit develop spots of melanophores, although these are somewhat less regular than in D. rerio, as is the wild-type D. kyathit stripe pattern. (E,F) duchamp hybrids for D. nigrofasciatus develop well-organized spots or even complete stripes. (G,H) duchamp hybrids for D. albolineatus exhibit a more severe melanophore reduction than observed in heterozygous duchamp mutant D. rerio or other hybrids, and these melanophores remain widely dispersed over the caudal flank. As in duchamp mutant D. rerio, gross deficits in xanthophore numbers were not apparent during pigment pattern metamorphosis (data not shown). (I,J) duchamp hybrids for D. `hikari' develop intermediate patterns, in which more melanophores are present than in D. albolineatus hybrids, but melanophore patterns range from weak clustering, to reticulation, to more uniform dispersion. (K-M) duchamp hybrids for the more distantly related D. choprae and D. dangila develop spots similar to the D. rerio species group. Scale bars: in A, 1 mm for A-L; in M, 0.5 mm for M,N.