Schematic sketch of the endophallus. Median ejaculatory guide blackened A Plateumaris sericea (and specimens identified as P. discolor) with apex of median ejaculatory guide rounded. The endophalli of specimens from Poland, Italy and Japan all look the same as in this sketch B Plateumaris shirahatai with apex of median ejaculatory guide notched (drawings by G. Geiser based on photographs from Askevold 1991 and Hayashi 2020).