Dinopedia
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The Cambrian–Ordovician extinction event occurred approximately 488 million years ago (m.y.a.). This early Phanerozoic Eon extinction event eliminated many brachiopods and conodonts, and severely reduced the number of trilobite species. It was preceded by the less-documented (but probably worse) End Botomian extinction event around 517 m.y.a. and the Dresbachian event about 502 m.y.a. The Cambro–Ordovician event ended the Cambrian Period, and led into the Ordovician Period in the Paleozoic Era.

Choia

Choia became extinct in the end of the extinction

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