Eurypterus remipes is a species of the Late Silurian eurypterids (order eurypterida, family eurypteridae) ^{1), 7)}, one of the well-known eurypterids, and inhabited the inland seas and the coastal area of North America, Europe ⁷⁾.

While some lineages of eurypterids are 2 m or more in length, which are the largest arthropods to have ever found ^{3), 7)}, E. remipes is approximately 20 cm in length ^{1), 4), 7)}, a relatively small group ^{1), 4)}.

Although the eurypterids are called "sea scorpions" informally and are resemble the extant terresterial scorpions morphologically, they are not specifically the closest relatives ^{3), 7)}. Many questions related to the evolution and the phylogeny of eurypterids still remain.

The eyes are reniforms, the first appendage is chelicera, the appendage II - V are walk-legs, and the VI appendages is paddle-like swimming leg ⁶⁾.

Eurypterus inhabited the brackish and hypersaline environments, such as intertidal zones, lagoons ^{1), 7)}. Eurypterus was a predator or scavenger that crawled in the shallow water bottom with walking and swimming legs and preyed on small invertebrates and detritus in the sedimentary mud ¹⁾.

Eurypterids have the book gills and the air-breathing organ called "Kiemenplatten", suggesting that they were able to breathe on land ⁵⁾. The "mas-moult-mate" hypothesis, eurypterids have migrated and molted in a group, and they have adopted the reproductive method using spermatophore transfer on land like did the extant arachnid has been proposed ²⁾. However, their primary habitat was aquatic environment ⁵⁾, they have sometimes crawled to the land to take advantage of the shallow water and pools as quiet environments during reproduction and moulting.