Figure 5. Two apparently complete apparatuses of Iowagnathus grandis n. gen. n. sp. from the Winneshiek Shale, each containing 15 elements, 14 of which are paired and one unpaired. The unpaired S0 (Sa) element and the paired M elements are marked by arrows in each apparatus. Note the constant locations of the pairedM elements in the apparatuses: (1) paratype, SUI 139887 (WS18-60); (2) holotype, SUI 139888 (WS18-266). Scale bar = 2mm.