Diverse caddis flies are recently collected from the Middle Jurassic Daohugou fauna in Ningcheng County,Inner Mongolia,northern China,and different types of caddis cases have been reported in the same locality.A new species of caddisfly,Liadotaulius daohugouensis sp.nov.is described and illustrated; the establishment is based on a well-preserved isolated forewing collected from the Middle Jurassic Jiulongshan Formation of Daohugou.The family status of Liadotaulius is discussed on the basis of new material and is referred to the family Philopotamidae.The Daohugou fauna continues to provide new data for studying the early evolution of Trichoptera.