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Keywords: Trilobites main morphological groups.svg tagmata 1 “ cephalon; 2 “ thorax; 3 “ pygidium Trilobites are so named for the three longitudinal lobes 4 “ right pleural lobe; 5 “ axial lobe; 6 “ left pleural lobe; the antennae and legs are not shown in these diagrams http //commons wikimedia org/wiki/File Trilobite_sections_numbered svg http //www trilobites info/cephalon htm Sam Gon III derivative by Obsidian Soul 2011-04-14 Cc-zero Trilobite whole external body views with legends |