Flourishing chancelloriids from the Cambrian Kaili Biota of South China

Diverse chancelloriids from two sections of the Kaili Biota (Cambrian Wuliuan Stage) in Guizhou Province, China, are systematically described. A total 25 complete individuals were collected calcareous silty mudstones Cambrian Formation and assigned to 3 genera 6 species, including Archiasterella anchoriformis sp. nov., Chancelloria zhaoi C. eros, Allonnia erjiensis, Al. phrixothrix, The new species Ar. with sclerites characterised by a large angle between marginal-lateral rays an obvious apical tuft represents first unambiguous scleritome South China. is dominated series bilaterally symmetrical, rosette-like that composed five or six lateral central ray. Moreover, based on careful survey spatial-temporal distribution (including both isolated sclerite fossils) flourishing ages, though may be related preservational bias, this metazoan group recognised: 1) significant diversification upper Stage 2 2) thriving Stage.