 A relationship with the Chelicerata, in a clade termed Arachnomorpha (Arachnata), was in vogue for some time, but, a more recent analysis of Panarthropoda suggests the trilobites are one of two major branches of Artiopoda.When trilobites are found, only the exoskeleton is preserved (often in an incomplete state) in all but a handful of locations.A few locations ("") preserve identifiable soft body parts (legs, gills, musculature & digestive tract) and enigmatic traces of other structures (e.g.