sentences: "Slimonia" is classified as part of the eurypterid family Slimonidae, within the superfamily Pterygotioidea.Historically "Slimonia" was first considered a member of the Pterygotidae, until it was reclassified alongside "Hughmilleria" and other genera to the family Hughmilleriidae in 1951 by Erik N. Kjellesvig-Waering.