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The taxonomic diversity, the nature of distribution and parasite host relations of the genus Oropsylla, whose fleas are vectors and keepers of the plague pathogen in foci of Eurasia and North America, are analyzed. The data on the abundance, ecological peculiarities and epizootological significance of the marmot parasite - the flea Oropsylla silantiewi (Wagner, 1898) in different plague foci of Palearctic area are summarized.

Comparative analysis of coregonid parasite fauna in 4 time intervals corresponding to different stages of the development of the lake was performed. It has been found that changes in the parasite fauna of coregonid fish is a process possessing specific features at different stages of lake development. The most significant changes in the fauna of Coregonidae parasites are characteristic of the first stage of eutrophication. At the stage of re-oligotrophication, the parasite fauna is formed on the basis of fundamentally new level of the parasite fauna formation, matching the current state of Lake Syamozero ecosystem. Parasite species tolerant to changing environmental conditions were revealed; problems of their stability are discussed.

In the present review, the main aspects of sexual behavior (finding and identification of sexual partner, copulation, reproductive isolation) in two main groups of hard ticks (Prostriata and Metastriata) are analyzed on the basis of literary and own data. A hypothesis dealing with main evolutionary trends in the development of sexual behavior in Ixodidae is proposed.

The annotated list of 46 mosquito species (Diptera: Culicidae) is the first list of this kind for the Northwest region of Russia. The paper is based on identification of species in authors' own collections (9 770 specimens), revision of collections of the Zoological Institute of the Russian Academy of Sciences (2 458 specimens) and the analysis of related literature. As a result, one new species is found for the fauna of Northwest region of Russia in general, seven - for separate regions (The Nenets Autonomous Okrug, the Murmansk, Arkhangelsk, Kaliningrad and Pskov regions) and one - for adjacent territories (Estonia).

The most appropriate methods for experimental study of cercarial response to host chemical signals were tested. The use of agar blocks impregnated with the second intermediate host metabolites was found to be the most effective for the study of contact responses, and the use of experimental chambers with narrow channels with gradient of chemicals, for the study of distant responses.

There are the first data on the parasites of the stoan loache Barbatula conilobus Prokofiev, 2016 in the Dzabhan River, Mongolia. As a result, 10 species of parasites of 4 systematic groups were identified: Cestoda - 1, Monogenea - 4, Trematoda - 4, Nematoda - 1. The monogeneans Gyrodactylus nemachili Bychowsky, 1936 and the trematode Diplostomum mergi Dubois, 1932 were the more abundant. For the metacercariae Diplostomum mergi, the sequences of the ITS1 + 5.8S + ITS2 rRNA (MK644609-MK644610) were obtained.