Parasitofauna of Succinea putris (Mollusca: Pulmonata) in the territory of St. Petersburg and Leningrad Region

During 2018–2024, the invasion of Succinea putris in St. Petersburg and the Leningrad Region was studied. The main attention was paid to the infection of snails with sporocysts of Leucochloridium. Three species of this genus were found: L. paradoxum, L. perturbatum and L. vogtianum. However, during the autopsy of Succinea putris, seven more species of parasites were noted, belonging to both trematodes and other groups of multicellular and even protists: ciliates of the Intramacronucleata subtype, coccidia Klossia sp., metacercariae of the trematodes Brachylaima mesostoma and Pseudoleucochloridium soricis, metacestodes Monocercus sp., nematodes of the Mermithidae family, dipteran larvae Pherbellia sp. In addition, various combinations of multiple infections formed by these parasites have been noted.