Female crab spider. Close-up of a female crab spider (Misumena vatia) waiting for prey on a flower. Female crab spiders may be yellow or white, depending on the flower in which they are hunting. They change colour by secreting a liquid yellow pigment into the outer cell layer of the body. On a white plant, this pigment is transported into lower layers, so that inner glands, filled with white pigment, become visible. If the spider dwells longer on a white plant, the yellow pigment is often excreted.
October 4th, 2018
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