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. 2021 Aug 2;379(2206):20200332. doi: 10.1098/rsta.2020.0332

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© 2021 The Authors.

Published by the Royal Society under the terms of the Creative Commons Attribution License http://creativecommons.org/licenses/by/4.0/, which permits unrestricted use, provided the original author and source are credited.

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Figure 6. — Spider eyes. (a–b) Eyes of Cupiennius salei. (a) Photograph of the primary and secondary eyes, showing the strong light reflection by the tapetum of the (upper) secondary eyes. (b) Seen through an ophthalmoscope through the transparent cuticular lens. the horizontal rows of photoreceptor cells are illuminated by light reflected by the tapetum. a and b reproduced with permission from [68]. (c) Methylene blue-stained cross sections through the postero-median eyes of the spiders (c) Agelena labyrinthica and (d) Drassodes cupreus. c and d reproduced with permission from [72]. (e–f) Electron micrographs of guanine crystals in the tapetum. (e) Agelena labyrinthica (f) Drassodes cupreus. Reproduced with permission from [72]. (g) 3D representation of corneal nanostructures in the eyes of a spider. Reproduced with permission from [73]. (Online version in colour.)