New species of green lacewings indicate the diversity of Mesypochrysa (Insecta, Neuroptera, Chrysopidae) from the Middle Jurassic of China.

Three new species of Mesypochrysa Martynov, 1927: Mesypochrysa paucinervis sp. nov., Mesypochrysa angusta sp. nov. and Mesypochrysa paradoxica sp. nov., are described from the Middle Jurassic Jiulongshan Formation of Daohugou, Inner Mongolia, China. The three species are assigned to Mesypochrysa based on the following characters: costal crossveins simple; two gradate series of crossveins present; MA and MP distally bifurcated; CuA with three to five pectinate branches; CuP distally bifurcated. Mesypochrysa paucinervis sp. nov. can be distinguished from other species of Mesypochrysa by nine RP branches and simple A1. Mesypochrysa angusta sp. nov. can be distinguished from other species by 16 RP branches and five CuA branches. Mesypochrysa paradoxica sp. nov. can be distinguished from other species by the distal position of 2m-cu. In addition, the position of 2m-cu in forewings of Limaiinae and distinguish characters of Mesypochrysa are discussed. The discovery of new fossil species enriches the species diversity of this taxon in the Jurassic, while also providing new evidence for the early evolution of chrysopids.