A member of Eodiscida, an extinct group of very small, primitive trilobites from the earliest Paleozoic Era.
From eodiscus (a genus name from eo- 'early' plus discus 'disk') plus -id (member of a group). Named for their small, disc-like appearance.
Eodiscids were some of the tiniest trilobites ever—barely bigger than a grain of sand—but they show up at the very bottom of the fossil record, making them living fossils from over 500 million years ago.
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