Chelicerata Heymons, 1901 †Eurypterida Burmeister, 1843 - eurypterids †Stylonurina Diener, 1924 Superfamily †Mycteropoidea Cope, 1886 Family †Hibbertopteridae Kjellesvig-Waering, 1959 Genus †Hibbertopterus Kjellesvig-Waering, 1959