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Cedaria
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trilobite
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Cedaria

trilobite genus
Written and fact-checked by
Britannica Editors
Encyclopaedia Britannica's editors oversee subject areas in which they have extensive knowledge, whether from years of experience gained by working on that content or via study for an advanced degree....
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History

Cedaria, genus of trilobites (extinct arthropods) that is a useful index fossil for Cambrian rocks and time (about 542 million to 488 million years ago). Cedaria was small, with a well-developed tail section and a prominent head section.

This article was most recently revised and updated by John P. Rafferty.