Conway Morris and Caron (2007) published the first description of "Orthrozanclus reburrus". This resembled the halkieriids in having concentric bands of sclerites, although only two and not mineralized; and "one" shell at what was presumed to be the front and which was similar in shape to "Halkieria"’s front shell. It also had long spines rather like those of "Wiwaxia". Conway Morris and Caron regarded this creature as evidence that the "halwaxiids" were a valid taxon and were monophyletic, in other words shared a common ancestor with each other and with no other organism. They published "two" cladograms, representing alternative hypotheses about the evolution of the lophotrochozoa, the lineage that includes molluscs, annelids and brachiopods: