Research Institute of Petroleum Exploration and Development, Beijing, China

Holotype SDL-99-0208 for Nilssoniopteris hamiensis Yi Zhao et S.H.Deng in Zhao, Deng, Shang, Leng, Lu, Fu & Ma

Holotype SDL-98-L2 for Nilssoniopteris crassiaxis Yi Zhao et S.H.Deng in Zhao, Deng, Shang, Leng, Lu, Fu & Ma