Youngolepis
Youngolepis is a genus of prehistoric lungfish which lived during the Early Devonian period. Fossils of Y. praecursor have been found in the Xitun Formation of China & the Bac [Bun Formation] of Trang Xa, Vietnam. Some additional fossil specimens from the Xishancun Formation of China have been referred to Youngolepis sp. & represent the oldest known occurrence of the genus. In addition, Y. praecursor is also found in the Xujiachong formation