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Fig. 1
Phylogenetic relationship and pigment patterns of D. rerio and D. nigrofasciatus.
(A) Phylogenetic relationships of selected Danio species [9]. (B) Danio rerio exhibit several dark stripes of melanophores with sparse iridophores, and light interstripes with abundant iridophores. Danio nigrofasciatus share common pattern elements but have fewer stripes and interstripes overall with spots forming ventrally instead of stripes. A shiny ventrum in both species results principally from iridophores that line the peritoneum, rather than iridophores in the hypodermis of the skin. Insets show iridescence of hypodermal iridophores.