Cephennodes impressifrons

Jałoszyński, Paweł, 2015, The Cephenniini of China. VI. New species and new records of Cephennodes Reitter from Hainan, Guangxi and Guangdong (Coleoptera: Staphylinidae: Scydmaeninae), Zootaxa 3990 (2), pp. 221-234 : 229

Cephennodes impressifrons species group

Species that belong in this group share a similar shape of the aedeagus, which represents a variant of the simonis form. The median lobe is strikingly large and slightly or moderately asymmetrical, not drop-shaped but rather oval, with the ventral membranous area small and concealed by the ventral aedeagal wall; the parameres are asymmetrical but in ventral view only a short apical part of the right paramere is bent or curved; the apical projections are short and with the ventral hook; the subapical area of the dorsal wall bears tiny setae. The head of males is always modified, with carinae and/or impressions. This group comprises currently eight species: C. impressifrons Jałoszyński, 2007 ( China) , C. carinifrons Jałoszyński, 2007 ( China) , C. triangulifrons Jałoszyński, 2007 ( China) , C. pteroscapus Jałoszyński, 2007 ( China) , C. rhinoceros Jałoszyński & Nomura, 2008 ( Thailand) , C. frontocarinatus Jałoszyński & Nomura, 2008 ( Thailand) , C. nasalis Jałoszyński & Nomura, 2009 ( Vietnam) and C. depressifrons Jałoszyński & Nomura, 2009 ( Vietnam) .