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Trilobitesclass of arthropods with an endoskeleton made up of three major parts (cephalon, thorax and pygidium), and divided longitudinally into a central axis and two pleural regions at the sides.
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Trilobitesancient arthropods having a hard outer skeleton, and which became extinct over 200 million years ago.
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Trilobites
trilobite|lang=en
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