Chelicerata Heymons, 1901
†Eurypterida Burmeister, 1843 - eurypterids
†Eurypterina Burmeister, 1843
†Diploperculata Lamsdell, Hoşgör & Selden, 2013
Superfamily †"Waeringopteroidea" nom. ined.
Genus †Orcanopterus Stott, Tetlie, Braddy, Nowlan, Glasser & Devereux, 2005