| Basic info | Taxonomic history | Classification | Included Taxa |
| Morphology | Ecology and taphonomy | External Literature Search | Age range and collections |
Polyernus complanatus
Taxonomy
Polyernus complanatus was named by Scudder (1885). Its type specimen is USNM 38144, an exoskeleton, and it is an impression. Its type locality is Mazon Creek, USNM Lacoe Collection, which is in a Westphalian D interdistributary bay mudstone in the Carbondale Formation of Illinois. It is the type species of Polyernus.