 "Wiwaxia", they argued, was clearly not segmented, as the numbers of sclerites in its three concentric groups did not match at all.They criticized Butterfield's main argument for "shoehorning" "Wiwaxia" into the polychaetes, that its sclerites were secreted by microvillae; such structures, they wrote, were also found in several groups of molluscs.Finally, in their opinion the absence of "legs" in "Wiwaxia" ruled out a close relationship with polychaetes.