The large male tarantula Pamphobeteus antinous is easily recognized at the presence of blue-violet iridescent bristles on some of the segments of its legs and pedipalps. The optical properties of these colored appendages have been measured and the internal geometrical structure of the bristles have been investigated. The coloration is shown to be caused by a curved coaxial multilayer which acts as a "cylindrical Bragg mirror".
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Simonis, P., Bay, A., Welch, V. L., Colomer, J-F., & Vigneron, J. P. (2013). Cylindrical Bragg mirrors on leg segments of the male Bolivian blueleg tarantula Pamphobeteus antinous (Theraphosidae). Optics Express, 21(6), 6979-6996. https://doi.org/10.1364/OE.21.006979