Blue color of ribbontail stingray skin stems from a core-shell photonic glass ultrastructure
Research Square (Research Square)(2023)
摘要
Abstract Blue structural colors, produced by diverse tissue nanostructures, are known from all major vertebrate clades except cartilaginous fishes (e.g. sharks, rays). We describe a bright angle-independent structural blue from ribbontail stingray skin, arising from a novel cell type with unique quasi-ordered arrays of nano-vesicles enclosing guanine nanoplatelets. This natural architecture —an intracellular photonic glass— coherently scatters blue, while broadband absorption from closely-associated melanophores obviates the low color-saturation typical for photonic glasses. This first demonstration of structural color in elasmobranchs (the oldest extant clade of jawed vertebrates) illustrates that the capacity for guanine-based colors likely arose extremely early in vertebrate evolution. The structure-function mechanisms underlying ribbontail stingray coloration point to selective pressures driving elasmobranch visual ecology and communication, but also strategies for biomimetic color production.
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关键词
stingray skin,glass,ribbontail,blue color,ultrastructure,core-shell
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