Revision of Eoiocossus (Insecta, Hemiptera, Palaeontinidae) from the Middle Jurassic of Northeastern China

The diagnosis of the genus Eoiocossus is emended based on new material of Eoiocossus conchatus comb. nov. from an outcrop of the Middle Jurassic Jiulongshan Formation at Daohugou Village in Ningcheng County, Inner Mongolia, China. This new material, with its complete fore- and hind wing, provides previously unknown hind wing characters for the genus Eoiocossus. In the hind wing, vein M is bifurcated into M1+2 and M3+4 basally; M1+2 branches soon after arising from M; M3+4 branched with stem of M3+4 long. A key and emended diagnosis is provided for Eoiocossus based on this new material.