This study was carried out to determine the Hirudinea fauna to Lake Karagöl (Sındırgı-Balıkesir, Turkey) and Lake Gölcük (Bigadiç-Balıkesir, Turkey), which has not been found in any limnological studies before. It was determined the species of Placobdella costata, Helobdella stagnalis, Hirudo verbana, Haemopis sanguisuga and Dina punctata in Lake Karagöl and P. costata, Glossiphonia concolor, Dina lineata and D. punctata in Lake Gölcük. According to the findings of the present study Dina punctata was reported for the first time in the Turkish Hirudinea fauna.

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