摘要: The genus Simocephalus Schoedler 1858,a large,nonpelagic daphniidae,are abundant in the littoral zone,expecially with submerged aquatic vegetation in freshwater bodies all over the world.More than 63 specific and subspecific names have been proposed.But in the recent research,all of them were divided into 4 subgenus and regarded as 20valid names[1].More than 12 species of genus Simocephalus were recorded in China[2—5],and most of them need to be re-examined according to modern standards.The valid of Simocephalus congener was controversial.Most authors suppose S.congener to be a synonym of S.exspinosus or a variety in the last century[1].Nowadays,S.