Fine structures of the ejaculatory sac and sperm pump of the scorpionfly Panorpa liui Hua (Mecoptera: Panorpidae).

Highlights: [•] Clarify the detailed structure of the ejaculatory sac and the sperm pump of the male scorpionfly Panorpa liui Hua. [•] Elucidate the ejaculatory mechanism of male scorpionfly in Panorpa (Mecoptera). [•] Definite some terminologies of the structures of male reproductive system in Panorpa include vasa deference, ejaculatory duct and ejaculatory sac. [ABSTRACT FROM AUTHOR]