Aedeagus 41–43 Dineutus orientalis 44–46 Gyrinus gestroi 47–49 G. japonicus 50–52 G. pullatus 53–55 Orectochilus villosus 41 dorsal aspect 42 median lobe (dorsal aspect) 43 ventral aspect 44 dorsal aspect 45 median lobe (dorsal aspect) 46 ventral aspect 47 dorsal aspect 48 median lobe (dorsal aspect) 49 ventral aspect 50 dorsal aspect 51 median lobe (dorsal aspect) 52 ventral aspect 53 dorsal aspect 54 median lobe (dorsal aspect) 55 ventral aspect.