Nematode
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1. Small, round worms, usually microscopic and colorless, which live free in moist soil, water, or in decaying or living organic matter. Parasitic forms puncture plant tissues by means of a stylet and live by sucking the juice of the plant.
A nematode inside a tomato root.
Source: http://www.ars.usda.gov/is/kids/suburb/story2/microscope.htm