Diodontus tristis (Vander Linden, 1829)

Distribution in Iran: Alborz (Ebrahimi 2014), Fars (Atbaei et al. 2015), Mazandaran (de Beaumont 1957), Tehran (Ebrahimi 2005, 2014).

General distribution: Austria, Belarus, Belgium, Bulgaria, Czech Republic, Denmark, Estonia, Finland, France, Germany, Great Britain, Greece, Hungary, Iran, Italy, Kazakhstan, Latvia, Liechtenstein, Lithuania, Luxembourg, Mongolia, Netherlands, Norway, Poland, Portugal, Romania, Russia, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Tajikistan, Turkey, Ukraine, Uzbekistan.