Abstract
Amphibians are widely involved as intermediate, definitive, and reservoir hosts in the circulation of many parasite species. The work is based on the material of the parasitological study of amphibians, collected on the territory of the Namangan region of Uzbekistan in 2019-2021. A total of 674 lake frogs (Pelophylax ridibunda) were uncovered. Two species of metacercariae of the trematode Echinostoma sp. and Tylodelphys clavata in the lake frog, the first recorded for the fauna of Uzbekistan. The abundance index of T. clavata (3.8 specimens) is higher than that of Echinostoma sp. (2.2 copies). For each species, the systematic position, range of hosts, localization, and data on the extent and intensity of invasion, place of discovery and description are indicated. At the same time, amphibians have been established as intermediate hosts for both types of trematodes. According to the comparative morpho-anatomical analyzes, it can be assumed that the smaller size of metacercariae is associated with the environmental conditions of the habitats of the hosts.
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