Category:Ordovician first appearances

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Handwiki book24.pngBiology portal

Here is a list of articles in the category Ordovician first appearances of the Biology portal. This category includes biological taxa of rank more inclusive than genus that evolved during the Ordovician period of geologic time, between 485.4 and 443.8 million years ago, as well as genera and species that evolved during this time and persisted across multiple geological periods.

Subcategories

This category has the following 6 subcategories, out of 6 total.