the cladogram below presents the inferred phylogenetic positions of most of the genera included in the three most derived superfamilies of the diploperculata infraorder of eurypterids (adelophthalmoidea, pterygotioidea and the waeringopteroids), as inferred by tetlie and poschmann in 2008, based on the results of a 2008 analysis specifically pertaining to the adelophthalmoidea and a preceding 2004 analysis.