A new species of Brachypremna Osten-Sacken,1887 from Dominican amber is described and illustrated,namely B.chenhuameii s......

为探究吕家坨井田地质构造格局,根据钻孔勘探资料,采用分形理论和趋势面分析方法,研究了井田7......

The Jehol fauna was initially represented by a bony fish, concostracan and an insect, as a Lycoptera davidi-Eosestheria-......