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Keywords from Image Description:
Trilobite sections numbered.svg en Diagram showing the three major sections of trilobite Cephalon Thorax Pygidium trilobites info htm Sam Gon III trilobites info Image SamGonIIIcepthopyg Ch vector Sam Gon III raster Trilobite cephalon ventral anatomy Trilobite facial suture types Trilobite hypostome types based on attachment