A report of biodiversity and abundance of freshwater mollusks in eastern rivers of Tehran Province

Molluscs are among the most important group of faunistic diversity in aquatic habitats. In this paper, abundance, species diversity and some of the morphological traits such as body length and whorl numbers of the mollusks found in three rivers, Hablehrood, Jajrood and Lar in east Tehran, through three seasons of autumn, spring and summer were studied. Totally five species in three families were found including Planorbis planorbis and Bulinus truncates in Planorbidae, Physa acuta in Physidae, Galba truncatula and Lymnaea palustris in Lymnaeidae. Both G. truncatula and B. truncates are first-reported for the rivers in east Tehran province. L. palustris had the most abundance, 43.29% of the total samples; the species was found in all the sampling stations. The effect of river and sampling season on the morphological traits was not significant.