The primitive and unique characters of extant mayflies.
Author of the article: ZHOU Chang-Fa1,ZHENG Le-Yi2
Author's Workplace：1.(Institute of Genetic Resources, College of Life Sciences, Nanjing Normal University, anjing210097); 2.(Department of Biology, Nankai University, Tianjin300071).
Key Words：Ephemeroptera; primitive characters; unique characters
Abstract：Extant Ephemeroptera retains a long series of primitive and unique characters, they contributed significantly to reconstruction of insect ground plan, investigation on origin of wing, evolution of venation and appendages and so on. These characters (prome