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About 100 micron or so, a tenth of a millimetre. Sometime a little larger (especially females) perhaps up to 300 microns. They are just about visible to the naked eye, but it depends on the background. You'll almost never see one on a bed for example, but I have seen them (1000s) crawl across the bench in the lab, when they escaped from breeding jars...

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16y ago

What else can I help you with?