author(s)
Mansoreh Sahyeghi, Hassan Vatandoost, Azim Paksa, Masome Amin, Homa Yousefi, Sara Rahimi, Madineh Abbasi and Amir Ahmad Akhavan

abstract
Some species of aquatic insect are medically important vectors that transmit diseases. Some of them also are used as an indicator of water pollution. There is little information about the aquatic insect's fauna of Iran.
To study the aquatic insects fauna, adult, nymphal and larval, species collection was done at five random points along Jajroud River in the protected area of Jajroud, Pardis is one of the cities of Tehran province, during summer 2015.
Totally, 306 samples were collected belonging to four orders: Diptera, Trichoptera, Ephemeroptera, and Coleoptera. Five genus identified, include Blepharicera, Simulium, Hydropsyche, Baetis, and Hybius. The most predominant genus was Simulidae (80%).