Orectochilus (Orectochilus) villosus villosus (Müller, 1776)

Distribution in Iran. Alborz (Hematyian et al. 2010), Mazandaran (Darilmaz et al. 2013), Qazvin (Ochs 1953), Iran (no locality cited) (Hafezieh 1997).

General distribution. Andorra, Armenia, Austria, Belgium, Bosnia Herzegovina, Bulgaria, Byelorussia, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Italy, Kyrgyzstan, Liechtenstein, Lithuania, Macedonia, Netherlands, Norway, Poland, Portugal, Russia (Central, Southern and Northern European Territory; East and West Siberia), Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey, Ukraine, former Yugoslavia (Mazzoldi 2003), Iran (Guéorguiev 1981; Mazzoldi 2003; Kiyak et al. 2006).

Comments. In slowly flowing streams, fresh water (Kiyak et al. 2006).