Materials to the helminth fauna of the marsh frog Pelophylax ridibundus (Pallas, 1771) (Amphibia: Anura) in the basin of the Bolshoy Cheremshan river (Samara region)

For the first time the data on the composition and structure of the helminth community and the degree of invasion of the marsh frog Pelophylax ridibundus (Pallas, 1771) from the basin of the Bolshoy Cheremshan River in the Samara region are presented. In 2018, 23 amphibian specimens were examined using the full helminthological autopsy method. 17 helminth species of two classes of helminths were found: Trematoda (13) and Chromadorea (4). The composition of helminths is typical for green frogs of the middle zone of the European part of Russia. Structure of helminthofauna of complicated type; host infestation of most trematode species is low. High intensity of invasion by trematodes Opisthioglyphe ranae and Paralepoderma cloacicola, mtc., which form the “core” of the helminth community of the Pelophylax ridibundus in the basin of the Bolshoy Cheremshan River, was noted. The structure of the helminthofauna and peculiarities of trematode infestation determine the “riverine” character of the helminth community, similar to this host in the Sok and Usa river basins.