Isotelus was a large trilobite that lived during the Ordovician period. Isotelus rex was largest of the Isotelus species and the largest known trilobite. It was 720 millimetres 28 inch long.
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Isotelus was a large trilobite that lived during the Ordovician period. Isotelus rex was largest of the Isotelus species and the largest known trilobite. It was 720 millimetres 28 inch long.