A family of extinct marine arthropods from the Paleozoic era, related to trilobites and characterized by distinctive segmented bodies.
From Greek 'eu' (well) + 'kleos' (fame) + Latin suffix '-idae' (family), a scientific taxonomic designation. Named in the 19th century by paleontologists studying ancient arthropod fossils.
Eucleids are so bizarre and alien-looking—they have compound eyes and segmented bodies like nothing alive today—yet they thrived for millions of years before vanishing in ancient extinction events, reminding us that Earth had a totally different cast of characters.
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