This timeline of eurypterid research is a chronologically ordered list of important fossil discoveries, controversies of interpretation, and taxonomic revisions of eurypterids, a group of extinct aquatic arthropods closely related to modern arachnids and horseshoe crabs that lived during the Paleozoic Era. Over 250 species of eurypterids in 74 recognized valid genera have been described since the discovery of Eurypterus remipes. The most recent genus to be described is Terropterus (2021) and the most recent species is its type species Terropterus xiushanensis (2021).