Guanine crystals of The Mirror spider.
"I have long observed the odd behavior of the Mirror Spider (Thwaitesia sp.) where the "silver-plates" on the abdomen seems to shrink when the spider is agitated (or perhaps threatened), revealing the actual abdomen. At rest, the silver plates expand and the spaces between the plates close up to become an almost uniform reflective surface. That is why I called it the Mirror Spider initially. Note that what I am posting are just observations and nothing is scientifically backed up. :)"
via Macro Photography in Singapore
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