Chelicerata Heymons, 1901 †Eurypterida Burmeister, 1843 - eurypterids †Stylonurina Diener, 1924 Superfamily †Stylonuroidea Kjellesvig-Waering, 1959 Family †Parastylonuridae Waterston, 1979 1 Genus †Parastylonurus Kjellesvig-Waering, 1966 2 Genus †Stylonurella Kjellesvig-Waering, 1966