The tubular animal was the first organism with skeletal structure on the earth. It was an elliptic tube-shape animal with nothing in abdomen.

Teachers and researchers of geology faculty of Kim Il Sung University excavated the fossil of the tubular animal in their in-depth research into the fossil of the Proterozoic era in some areas including Thangyo-ri, Phyongsan County, North Hwanghae Province.

They found out fossils of primitive seaweeds and primitive jellyfish belonging to the period of transition from one-cell to multi-cell in Juche 90 (2001). Recently they discovered the fossil of the 5cm-long tubular animal again on the same stratum.

According to varied analysis, the fossil is 620,000,000 years old.

The excavation of the fossil helps towards solving the crustal formation in a scientific way and concretizing the evolution process of organism.