Abstract
This is the first review of the helminth fauna of the moor frog Rana arvalis Nilsson, 1842 from the Volga river basin (Russia). The article summarizes the authors’ and literature data on the helminthic fauna of this species. The method of complete helminthological dissection was used. Thirthy-eight helminth species were recorded from three classes: Cestoda (1), Trematoda (28), and Chromadorea (9). Nine helminth species are new to the moor frog in Russia: trematodes Gorgodera varsoviensis Sinitzin, 1905, Strigea falconis Szidat, 1928, larvae, Neodiplostomum spathoides Dubois, 1937, larvae, Tylodelphys excavata (Rudolphi, 1803), larvae, Pharyngostomum cordatum (Diesing, 1850), larvae, Astiotrema monticelli Stossich, 1904, larvae and Encyclometra colubrimurorum (Rudolphi, 1819), larvae, nematodes Strongyloides spiralis Grabda-Kazubska, 1978 and Icosiella neglecta (Diesing, 1851). The cestode Spirometra erinacei (Rudolphi, 1918), larvae were observed of this amphibian species in the Volga basin for the first time. The nematodes Rhabdias bufonis, Oswaldocruzia filiformis, Cosmocerca ornata and the trematode Haplometra cylindracea form the core of the helminth fauna of the moor frog. Information on species of helminths includes systematic position, localization, areas of detection, type and scheme of life cycle, geographical distribution, and degree of specificity to host amphibians.
Highlights
In recent decades, the study of amphibian parasites has become more relevant
Amphibian populations are sharply declining around the world [1,2,3]
Trematodes and cestodes were immobilized by heating, fixed with ethanol under pressure, and and processing of helminthological material were performed by standard m stained with alum carmine and encased in Canadian balsam
Summary
The study of amphibian parasites has become more relevant. This is due to the crisis that this group of vertebrates is experiencing. The formation of deviant forms of skeletal elements significantly reduces the survival rate of the young generation of amphibians and facilitates their consumption by predators Another type of pathology is a violation of the functioning of the internal organs of the hosts, leading to their death. There was no summary on the helminths of R. arvalis, which inhabit the Volga river basin Such a paper is needed due to the abundance of such information, changes in the systematics of helminths, and the long-term nature of the observations. The material for the study was personal fees and information about helminths from 990 specimens of moor frogs from eight regions of the Volga basin: Vologda, Ivanovo, Nizhny Novgorod, Samara and Saratov regions, the Republics of Mordovia, Tatarstan, and Bashkortostan (Figure 1)
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