What is "acutiramus"

Acutiramus is an extinct genus of eurypterid which lived in the Late Silurian ( Ludlow) to Early Devonian.

Acutiramus is one of the largest eurypterids with pincers 5 cm and length about 2 m. The genus closely related to Pterygotus, of which several species were originally placed in, and to the giant Jaekelopterus.