Editing Trilobite (section)

====Silurian and Devonian====
[[File:Trilobite diversity EN (cropped).png|thumb|upright|Number of families, Middle Devonian to Upper Permian. Proetida – brown, Phacopida – steel blue, Lichida – clear blue, Harpetida – pink, Odontopleurida – olive and Corynexochida – purple]]Most [[Llandovery epoch|Early Silurian]] families constitute a subgroup of the Late Ordovician fauna. Few, if any, of the dominant Early Ordovician fauna survived to the end of the Ordovician, yet 74% of the dominant Late Ordovician trilobite fauna survived the Ordovician. Late Ordovician survivors account for all post-Ordovician trilobite groups except the [[Harpetida]].<ref name="Adrain98" /> Silurian and [[Devonian]] trilobite assemblages are superficially similar to Ordovician assemblages, dominated by [[Lichida]] and [[Phacopida]] (including the well-known [[Calymenina]]).<ref name="Fortey&Owens97a" /> The Silurian diversity of trilobites was high during the [[Llandovery Epoch|Llandovery]] and [[Wenlock Epoch|Wenlock]], though there was a sharp drop during the [[Pridoli Epoch|Pridoli]] at the end of the period, followed by a diversification during the Early Devonian, reaching a highpoint of 180 trilobite genera during the [[Emsian]] stage.<ref name=":0" />

The Middle-Late Devonian was a decisive turning point in trilobite history, with the [[Taghanic event]] during the [[Givetian]] sharply decreasing trilobite diversity, particularly in shallow water environments, which was followed by the [[Late Devonian mass extinction]]/Kellwasser event (involving a combination of [[Past sea level|sea level change]] and [[Anoxic event|marine anoxia]]) at the [[Frasnian]]-[[Famennian]] boundary, widely regarded as one of the most significant mass extinction events in Earth's history, decimating the groups diversity including the extinction of the orders [[Corynexochida]], [[Harpetida]] and [[Odontopleurida]], with the low trilobite diversity in its aftermath in the Famennian, consisting only of the orders [[Phacopida]] and [[Proetida]], being again strongly impacted by the [[Hangenberg event]] (also called the end-Devonian mass extinction) at the end of the Devonian, with both shallow water and deep water trilobites being affected.<ref name=":0" /> Only a single order, the Proetida, survived into the Carboniferous.<ref name="Clarkson98" />

Genera of trilobites during the Silurian and Devonian periods include:<ref name="PREHISTORIC LIFE" />

*''[[Dalmanites]]'' (Early to Late Silurian)
*''[[Calymene]]'' (Silurian)
*''[[Encrinurus]]'' (Silurian)
*''[[Exallaspis]]'' (Middle to Late Silurian)
*''[[Paralejurus]]'' (Early Devonian)
*''[[Lioharpes]]'' (Early-Middle Devonian)
*''[[Phacops]]'' (Middle to Late Devonian)