[Phylum] [Arthropoda] Siebold, 1848 - arthropods Chelicerata Heymons, 1901 Euchelicerata Weygoldt & Paulus, 1979 [Order] †Eurypterida Burmeister, 1843 - eurypterids [Suborder] †Eurypterina Burmeister, 1843 Superfamily †'Eurypteroidea' Burmeister, 1843 [monophyletic?] Genus †Pentlandopterus Lamsdell, Hoşgör & Selden, 2013