Genus: Largirostrisornis HOU, 1997
Etymology: Latin, large, "plentiful or bountiful," Latin, rostrum, "bill or mouth": with reference to the large beak on this genus.

Species: sexdentoris HOU, 1997
Etymology: Latin, sex, "six" and Latin, dent, "teeth": 6 teeth.

Holotype: IVPP V.10531

Locality: Boluochi, Chaoyang City, Liaoning Province, China.

Horizon: Horizon IV, Jiufotang Formation, Upper Jehol Group.

Biostratigraphy: Psittacosaurus fauna, Cathayornis-Chaoyanga Avifauna.

Age: Barremian Stage, Lower Gallic Subepoch, Lower Early Cretaceous Epoch, Early Cretaceous.

Material: Fragmentary skull and fragmentary skeleton.