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Ordovician first appearances

Topic: Category

 From Wikipedia - Reading time: 1 min

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.

See also the preceding Category:Cambrian first appearances and the succeeding Category:Silurian first appearances
See also: Category: Ordovician extinctions
Licensed under CC BY-SA 3.0 | Source: https://en.wikipedia.org/wiki/Category:Ordovician_first_appearances
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