Category:Extant Ordovician first appearances

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This category includes biological taxa that evolved during the Ordovician period of geologic time, between 485.4 and 443.8 million years ago and have not yet gone extinct.


This category has only the following subcategory.


Pages in category "Extant Ordovician first appearances"

The following 25 pages are in this category, out of 25 total. This list may not reflect recent changes (learn more).