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A number of human and animal diseases can be caused by viruses, which are transmitted by arthropods (e.g. arthropod-borne virus). These arthropod vectors show a growing importance in many European countries, including Romania. Globalization and climate change creates favorable conditions for several exotic pathogens to enlarge their original ranges toward temperate regions. Our research aim is to reveal mosquito species which could be potential vectors of mosquito-borne viruses (e.g. mobovirus). hi this study, we are focusing on different wet ecosystems in a metropolis with important human concentration, such as Cluj-Napoca. Using a standard collection method (gravid traps), we performed a longitudinal survey to identify and describe mosquito communities as well as to detect moboviruses occurring in the area. During our work, molecular tools were used, such as pan-PCR and cell cultures. A total number of 728 Culicidae individuals were collected, belonging to 14 different species. We found 11 vector species, which are potential transmitters of mobovirus. Nine species are reported for the first time around Cluj-Napoca, based on our results. Coquiuettidia richiardii is reported here for the first time from Transylvania. The high number of Culicidae species identified in the area of Cluj Napoca is likely to be the result of the presence of a large variety of suitable habitats. Despite the high number of specimens collected, all samples were negative to arboviruses, thus the Culicidae fauna of the area show a low significance in medical importance.