Gyrinus ( Gyrinus ) distinctus (Aubé, 1838), Aube, 1838

Gyrinus ( Gyrinus) distinctus (Aubé, 1838)

Distribution in Iran. Alborz ( Hematyian et al. 2010), Fars ( Hosseinie 1978), Guilan ( Guéorguiev 1965c; Darilmaz et al. 2013), Khuzestan ( Ghodrati et al. 2014), Lorestan ( Farzam Motlagh et al. 2012), Markazi ( Vafaei 2005; Vafaei et al. 2004), Mazandaran ( Ochs 1953; Vafaei et al. 2009), Sistan & Baluchistan ( Ochs 1957), Tehran ( Vafaei et al. 2009), Iran (no locality cited) ( Hafezieh 1997).

General distribution. Afghanistan, Austria, Azerbaijan, Belgium, Bosnia Herzegovina, Bulgaria, Byelorussia, Croatia, China ( Nei Mongol, Xinjiang, Xizang) , Cyprus, Czech Republic, Denmark, Egypt, Finland, France, Great Britain, Germany, Greece, Hungary, India (Kashmir), Iraq, Israel, Italy, Kazakhstan, Kyrgyzstan, Lebanon, Lybia, Macedonia, Mongolia, Netherlands, Norway, Poland, Portugal, Russia ( Central, Southern and Northern European Territory) , Slovakia, Spain, Sweden, Switzerland, Syria, “Transcaucasia”, Turkey, Uzbekistan, former Yugoslavia ( Mazzoldi 2003), Iran ( Guéorguiev 1981; Mazzoldi 2003; Darilmaz & Kiyak 2006; Kiyak et al. 2006).

Comments. This species has a dark ventral side. Specimens with a light ventral side were described by Régimbart, 1883 as G. fairmairi . Generaly last “species” is considered as an aberration of G. distinctus . Ochs (1953), however, never found intermediate forms, at least leaving the discussion open if fairmairi is just an aberration of distinctus . Therefor records of G. fairmairi or G. distinctus faimairi are treated separately below. Bodemeyer (1927) collected Gyrinus natator Linné, 1758 in Guilan, in a pool in the Elbruz Mountains, but it most likely concerns G. distinctus . Along coasts of dam lakes and slowly flowing streams; fresh and brackish water (Kiyat et al. 2006). On surface of clear, small, slow-moving streams ( Hosseinie 1978). Up to an altitude of 2100 m ( Ochs 1953).