Period: Early Cambrian 518MA Origin: China, Yunnan, Chengjiang biota Size: 3.5 cm Top quality of Leanchoilia. The four appendages are the tool for Leanchoilia to eat. They’re really hard to keep in the fossil. Free shipping! Leanchoilia is an megacheiran arthropod known from Cambrian deposits of the Burgess Shale in Canada and the Chengjiang biota of China. It had long, whip-like feelers mounted on frontal arm-like appendages. Its internal organs are occasionally preserved within the substrate in three dimensions.