[Phylum] [Arthropoda] Siebold, 1848 - arthropods Chelicerata Heymons, 1901 Euchelicerata Weygoldt & Paulus, 1979 [Order] †Eurypterida Burmeister, 1843 - eurypterids [Suborder] †Stylonurina Diener, 1924 Superfamily †Rhenopteroidea Størmer, 1951 [monotypic] Family †Rhenopteridae Størmer, 1951 Genus †Brachyopterus Størmer, 1951