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An order of Trilobita that lived in the Lower to Middle Cambrian. They had large eyes, a large, semicircular cephalon with strong genal spines, many small, often spiny, thoracic segments, and a tiny pygidium. There were four suborders. Some, especially members of the suborder Olenelloidea, are important stratigraphic markers.

Subjects: Earth Sciences and Geography.

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