Glossary Definition
Trilobites are an extinct group of arthropods, distinguished by the following characters:
  • a body built from a cephalon, thorax, and pygidium
  • a body divided into three lobes, running from head to tail
  • one pair of antennae


The last trilobites went extinct about 245 million years ago, but they are well represented by the fossil record.

trilobite trilobite

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