Trilobite
삼엽충
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<speciesfyi-glossary slug="trilobite"></speciesfyi-glossary>Definition
An extinct group of marine arthropods that thrived for over 270 million years, serving as important index fossils.
Detailed Explanation
Trilobites are exceptional index fossils because they were abundant, marine, globally distributed, and evolved rapidly — their distinctive forms allow precise dating of Paleozoic strata. Their compound eyes are among the earliest known complex visual organs in the fossil record. The cause of their final extinction at the end-Permian mass extinction remains debated. Over 20,000 trilobite species have been described, representing one of the most diverse animal lineages in Earth's history.