The Chengjiang Lagerstätte in the Lower Cambrian of South China yields a small, larva-like arthropod, which was considered to be a protaspis of naraoiids by many authors. The discovery of a large number of well-preserved specimens from many new localities has allowed the original study to be revised. The relatively large size, stable morphology and unusual structure of the appendages indicate
... [Show full abstract] that these specimens represent adults of a new arthropod, Primicaris larvaformis. The larva-like outline is considered to have arisen by the heterochronic process of progenesis. In addition, this animal displays primitive aspects of bodyplan and limb morphology that suggest a basal position within arachnomorphs, or perhaps even arthropods, and the similarities to the Vendian arthropod-like animal Parvancorina probably provide an evolutionary link between Vendian forms and Cambrian arthropods.