 The appendage-bearing segment is fused to the telson in certain members of Artiopoda, including some aglaspidids, which may have secondarily lost the appendages.Leif Størmer recognised on the basis of limb types that a diverse group of Cambrian arthropods, known largely from the Burgess Shale, were likely to be relatives of the trilobites.Hou and Bergström formalised this grouping into the Lamellipedia, consisting of two clades