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. Also preserved are fossils of orthocerids, such as Geisonoceras maclareni. Similar levels of eurypterid diversity are also observed in fossil deposits where other species of Slimonia have been found. S. acuminata has been found associated with Nanahughmilleria lanceolata, Hardieopterus lanarkensis, Eusarcana obesus, Parastylonurus sigmoidalis, Carcinosoma scorpionis and Erettopterus bilobus and S. stylops have been found associated with Nanahughmilleria pygmaea, Eusarcana salteri, Hardieopterus megalops, Erettopterus brodiei, Erettopterus gigas, Hughmilleria banksi, Eurypterus cephalaspis and Pterygotus ludensis.