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In this paper, the data on fauna of Nevermanniini и Wilhelmiini tribes (Diptera: Simuliidae) were analyzed. All the accessible literature sources, institute collections and new materials recently collected in Yakutia were examined. Regional fauna was supplemented by two species: Schoenbaueria dendrofila (Patrusheva, 1962) and S. furculata Shewell, 1952, the latter being new for the Russian fauna also. The distribution of five more species from Simuliidae family was clarified. Processing of the collected material proved that 10 species previously registered in Yakutia can still be found in the region.

Methods of in vitro cultivation were used to examine the feeding and reproductive behaviors of daughter rediae of Echinostoma caproni. It was noted that under conditions of in vitro cultivation, rediae fed on tissues of the mollusc Biomphalaria glabrata, on rediae and cercariae of E. daikenaensis and E. congoensis, and on sporocysts and cercariae of Schistosoma mansoni. No cases of cannibalism of daughter rediae E. caproni by their offspring rediae were observed, although they could feed on their own cercariae. When kept in mediae containing (B. glabrata embryonic) Bge cells, rediae E. caproni gradually turned to feeding on these cells and stayed away other objects. Under conditions of in vitro cultivation, daughter rediae E. caproni were capable of forming redial and cercarial embryos. However, no cases of return from producing of cercariae to producing of rediae were observed. These in vitro data confirm the results of previous studies of this species's parthenithae performed in vivo (Атаев и др., 2007).

Four native species of parasitic mites belonging to the genus Schizocarpus Trouessart, 1896 (Acariformes: Chirodiscidae) are recorded on the North American beaver Castor canadensis Kuhl, 1820 (Rodentia: Castoridae) from Russia. Totally ten beavers from all three main geographically isolated populations of in Russia (Leningrad Province, Voronezh Biosphere Reserve (beaver farm) and Khabarovsk Territory) were examined. Additionally, in captivity (Voronezh beaver farm) eight species were recorded switched from the Eurasian beaver Castor fiber Linnaeus, 1758 on C. canadensis.

The type material on Otidilepis tetracis (Cholodkowsky, 1906), the type species of the genus Otidilepis Yamaguti, 1959 is reinvestigated. The validity of the genus Otidilepis is confirmed. It is clearly distinguished from the genus Hispaniolepis Lopez Neyra, 1942 by the form and dimensions of the rostellar hooks as well as by the proportions of the attachment organs of the scolex (diameter of suckers: width of the rostellum). "Orthodiorchoid" type based on the hooks of D. acuminata (Clerc, 1902), type species of the genus Diorchis Clerc, 1903, is introduced. The former "diorchoid" type, based on the hooks of D. americana Ransom, 1909, is renamed in "americanoid". Rostellar hooks of O. tetracis belong to the americanoid type.

The use of scanning and electron microscopy methods has shown that porous areas (area porosa) on the gnathosoma of Ixodes ricinus are formed of cuticular orifices of bicellular glands. Each gland is formed of a duct cell and a glandular cell, characterized by high degree of secretory activity. No difference in the gland structure between females and males were revealed. Questions associated with a probable function of these glands are discussed.

Based on the forest woody species wilt areassurvey in Nizhniy Novgorod region in August 2014, the possible factors of the pest spread risk modelling were analysed on six species of the genus Bursaphelenchus and Devibursaphelenchus teratospicularis using six parameters: plant host species, beetle vector species, average temperatures in July and January, annual precipitation. It was concluded that these parameters in the evaluated wilt spots correspond to climatic and biological data of the already published woody plants wilt records in Europe and Asia caused by the same nematode pest species. It was speculated that the annual precipitation of 600 mm and average July temperature of 25°C or higher, are the critical combination that may be used to develop the predicative risk modelling in the forests' and parks' wilt monitoring.

In the north of the Pskov region (58°35' N, 28°55' E) the appearance of a single colony of true bugs Pyrrhocoris apterus has been recorded. Dissection of 95 individuals from this colony revealed 100% prevalence of infection with homoxenous trypanosomatids. In 3% of the cases intestinal infection was accompanied by hyperinvasion into the salivary glands and hemolyph of the hosts. Analysis of trypanosomatid morphotypes demonstrated mixed infections in all studied P. apterus individuals. At least 4 forms of promastigotes along with epimastigotes, choanomastigotes and amastigotes were found. The distribution of the trypanosomatid morphotypes over all intestinal parts as well as salivary glands and hemolymph was investigated. Three isolates of the flagellates were deposited into the living cultures collection of the laboratory of Protozoology of the Zoological institute of the Russian Academy of Sciences.

The data on scientific and teaching activities of A.A. Filipchenko, doctor of medicine and scientist-parasitologist, one of the founders of ecological parasitology in Russia is presented in this article. His fate and participation in the formation of this biological discipline were concealed for a long time. One of the reasons for this situation is the destruction of the scientist in 1938 during the course of mass repressions performed by Soviet State against its own citizens.

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