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Trilobites are the single most diverse group of extinct organisms that ever existed, period! The smallest known trilobite is just three millimeters long, while the largest type grew to a length of 70 centimeters (over two feet long!).
Trilobita: Life History and Ecology. Most trilobites lived in fairly shallow water and were benthic; they walked on the bottom, and probably fed on detritus. A few, like the agnostids, may have been pelagic, floating in the water column. Cambrian and Ordovician trilobites generally lived in shallow water. After the Ordovician, when many trilobite groups declined or went extinct, the survivors tended to be restricted to deeper water. Food particles were stirred up by the legs and passed forward to the mouth.