Category:Middle Ordovician first appearances

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Biological taxa that first appeared during the Middle Ordovician epoch of geologic time, between 470 and 458.4 million years ago.

See also the preceding Category:Early Ordovician first appearances and the succeeding Category:Late Ordovician first appearances

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Retrieved from "https://mdwiki.org/wiki/Category:Middle_Ordovician_first_appearances"