Harpetida

== Translingual == === Etymology === Harpes +‎ -ida === Proper noun === †Harpetida A taxonomic order within the class Trilobita – trilobites that lived from the Upper Cambrian to the Late Devonian periods. === Further reading === Harpetida on Wikipedia.Wikipedia Harpetida on Wikispecies.Wikispecies Category:Harpetida on Wikimedia Commons.Wikimedia Commons