A new genus and species of Chresmodidae (Insecta: Gryllones) from Upper Jurassic-Lower Cretaceous of Yixian Formation, Inner Mongolia, China

A new genus with a new species of Chresmodidae (Insecta: Gryllones), Sinochresmoda magnicornia gen. et sp. nov., including specimens of male, female and nymph, is described and illustrated. These fossils were collected from the Upper Jurassic-Lower Cretaceous of Yixian Formation of Liutiaogou Village, Inner Mongolia (Nei Mongol Autonomous Region), China. Both male and female possess wings, and have sexual dimorphism in antenna. Antennae of male are highly specialized and horn-shaped, incurvated as horn with the scape strongly expanded, and the first segment of the flagella incurvated as a pair of brackets, while antennae of female are normally filiform. Wings of the new species are short, not exceeding the length of the abdomen. Fringe hairs along the wing margins, a unique feature for Chresmodidae, are dense, wavy and bundled together. Nymphs and adults probably lived in the same environment. In addition, one specimen demonstrates the extraordinary structure of tarsus with a high number of "tarsomeres", which has been reported in other species of this family.