Leptochilodiscus
 ( 1943 ) Order Agnostida ( Salter 1864 ) It lived during the Botomian stage = late Lower Cambrian Stage 4 ( upper of two stages subdividing the un-named Series 2 ) ; the upper Botomian Stage boundary corresponds to base of both the Middle Cambrian Wuliuan stage and Miaolingian Series . 
<triplet> Miaolingian <subj> Wuliuan <obj> has part