Enigmatic mesozoic bark-gnawing beetles (Coleoptera: Trogossitidae) from the Jiulongshan formation in China

Two enigmatic genera of Trogossitidae are described and illustrated from well-preserved impression fossils from the Middle Jurassic Jiulongshan Formation collected at Daohugou Village, Shantou Township, Ningcheng County, Inner Mongolia, China. Both new genera, Marginulatus gen. nov. (type species M. venustus sp. nov.) and Latitergum gen. nov. (type species L. glabrum sp. nov.) are placed in Trogossitidae incertae sedis because they have a mixture of characters that do not allow for them to be easily placed in the current classification of Trogossitidae.