Acidiscus
It lived during the Botomian stage = late Lower Cambrian Stage 4 ( upper of two stages subdividing the un-named Series 2 ) ; the upper Botomian boundary corresponds to base of the Middle Cambrian , Miaolingian Series and Wuliuan stage . 
<triplet> Miaolingian <subj> Wuliuan <obj> has part <triplet> Wuliuan <subj> Miaolingian <obj> part of