Yunnan Chengjiang Fossil, in the southwest of China, was included into the World Heritage List on July 2012. It is the first ancient Chinese fossil site to make the list, and the fourth world heritage in China’s southwest Yunnan province.
These fossils in Yunnan present the most complete record of an early Cambrian marine community with exceptionally preserved biota, displaying the anatomy of hard and soft tissues in a very wide variety of organisms, invertebrate and vertebrate. They record the early establishment of a complex marine ecosystem, presenting exceptional testimony to the rapid diversification of life on earth 530 million years ago.
On July 1st, 1984, Mr Hou Xianguang, a renowned paleontologist in China, discovered the paleontological fossil site in Maotianshan Mt of Chengjiang County in Yunnan province. A massive, systematic collecting work was then launched. The discovery of Chengjiang zoolites has shocked the science circle of the world.
Worm (animals) fossils under the Nematomorpha phylum are one of the most common at Chengjiang fossil site of Yunnan. Their bodies resemble to slim cylinders. So far, three genera and three species have been discovered.