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The "Spots": The dark patches on the body (which give the mite its common name) aren't actually pigmentation on the skin. They are the visible contents of the mite's digestive tract showing through its translucent body.Size: The small dotted circle in the top left corner contains a tiny speck. This is a scale marker intended to show the mite's actual size to the naked eye—roughly 0.4 mm (about the size of a grain of salt).Anatomy: As members of the Acari subclass (related to spiders and ticks), adults have eight legs. The illustration captures the fine, hair-like bristles (setae) covering the legs and body, which help the mite sense its environment.