Checklist and key identification of Chironomidae Larvae (Insecta: Diptera) in Marbor River (Isfahan, Iran)

Chironomidae (Diptera) which are distributed worldwide، are the most abundant and diverse insects in many freshwater ecosystems، as well as inland waters of Iran. However، very few researches were done for identification of this group in Iran، and there is a poor knowledge of their faunal diversity distribution in this country. To investigate chironomid larvae in Marbor river، Isfahan Province، seasonal samplings were done (2003-2004) in five selected sites along the river course، using Dredge sampler 3 times for every site. After collecting، the samples were preserved in formaldehyde at the site. Samples were sorted out in laboratory and the Chironomidae larvae were identified down to the generic level using the identification keys، and light and phase-contrast microscopes. Results revealed 39 genera from four subfamilies in Marbor River: Chironominae (15 genera)، Diamesinae (2 genera)، Orthocladiinae (17 genera) and Tanypodinae (5 genera). From these، 13 genera were reported for the first time in Iran. An identification key for the taxon in Marbor river was provided.