Abstract
The Eastern medical leech (Hirudo orientalis Utevsky et Trontelj, 2005) belongs to the Hirudinea class to a Euhirudinea subclass to the Gnathobdellidae order, Hirudo genus. H. orientalisis ectoparasitic bloodsucking. Medicinal leeches feed by sucking blood of the vertebrates such as mammals, fish, amphibians, birds and reptiles. They live in the freshwater basins in swamps, rivers and lakes. Materials were collected through the suture-catching nets to breed leeches and carry out investigations in laboratory conditions. The study was carried out in 2018-2020 in the 42 water bodies of the Lankaran natural province. H. orientalis was found in only 16 of them. The weight of the collected leeches was 1.0-2.5 g, and the length was between 4-10 cm.
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