sentences:  "Slimonia" was very similar to the basal pterygotid "Erettopterus" in terms of visual acuity, with the number of lenses being comparable to those of "Pterygotus" and "Jaekelopterus" and possessing an IOA between 2 and 3 (which is higher than the IOA of "Pterygotus" and "Jaekelopterus", suggesting that the visual acuity of "Slimonia" was good, but not as good as in the derived pterygotids).Fossils of "Slimonia" have been recovered in deposits home to diverse eurypterid faunas.Telychian deposits in the Pentland Hills, where remains of "S. dubia" have been found, preserve fossils of a large amount of other eurypterids, including "Drepanopterus pentlandicus", "Laurieipterus elegans", "Parastylonurus ornatus", "Hardieopterus macrophthalmus", "Carcinosoma scoticus", "Stoermeropterus conicus" and "Pentlandopterus minor".