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Dactylogyrids, possessing a wounder type of anchors attach themselves between respiratory folds of fish gills. The ventral side of the haptor is fixed by 10 marginal hooks, while the dorsal side by 2 anchors and 4 marginals. This type of attachment was called thrust anchoring. Such types of attachment as hooking, pinching and embracing (or clasping) are also regarded. Each mode of attachment is characterized by its own types of anchors. The generic status, however, was given only to the species with the clasping type of attachment. Groups of species with different modes of attachment need separation into distinct genera. Parasitism of worms on other organs than gills results in a change of attachment mode and morphology of anchors. These groups of species need generic status, too.

The species Drepanidotaenia spinulosa Dubinina, 1953 is redescribed as Drepanidolepis spinulosa (Dubinina, 1953) comb. nov. The monotypical genus Anatinella Spassky et Spasskaja, 1954, the type species of which was D. spinulosa, is reduced to a synonym of the genus Drepanidolepis Lopez-Neyra, 1942. The stability of some systematic characters of hymenolepidids possessing three testes is discussed. A new diagnosis of the genus Drepanoidolepis is given.

On the basis of studies of the original preparation of A. filum from the collection of Clerc, the author of the genus Aploparaksis Clerc, 1903, (Muzeum of Natural History, Geneva), my own materials from different regions of the USSR and preparations from museums of Moscow, Leningrad, Geneva, London, Beltsville (USA) as well as on the basis of analysis of literary data the question on the type species of the genus, A. filum (Goeze, 1782) Clerc, 1903, is settled. The neotype of A. filum (preparation No 664, Museum of GELAN, Moscow, USSR) was designated. A. filum sensu Davies, 1940 and sensu Spassky, 1963 was separated into a distinct species for which the name A. thomasi nom. nov. was given (preparation from the Davies collection No 665, Museum of GELAN, Moscow, USSR). Experimental data on the life cycle of A. filum are given. Metacestode is classified as a typical diplocyst and localized in connective tissue of the abdominal nervous chain of Eiseniella tetraedra and Octolasium lacteum.

Study of communities of shelter arthropods from gulls' nests was conducted from 1981 to 1986 on the lakes Saltaim-Tenis in the northern forest-steppe of West Siberia (Omsk District). It has been found out that the population of shelter arthropods is formed at the expense of free living species (predators, saprophags) and immigrating parasites. Composition and changes in the number of arthropods in the gulls' nests depend on the peculiarities of the biotope and peculiarities of the bird biology (primarily the female behaviour). Reproduction of hematophags, characteristic of the gulls' nests, is connected with a period of optimal microclimatic regime in the nest.

Possible reasons of a successful development of Plasmodium gallinaceum in Aedes aegypti, which were not given sugar feeding, are analysed. Such reasons are assumed to be high contents of sugars (up to 200 mg/% in the blood of chickens-donors) and retention of sugar in the crop of mosquitoes, which were fed from a tampon, in control.

Data are first given on the infection rate of wild Anatidae with the species Leucocytozoon simondi in North Palaearctic between 65° and 171° E. In Palaearctic this haemosporidia penetrated far beyond the North polar circle, adapted to the circulation under severe taiga conditions, thus providing a high infection of birds. On the basis of obtained data and analysis of literature there were defined the borders of the area and peculiarities of the geographical distribution of L. simondi, a pathogenic parasite, which causes leucocytosis in domestic and wild Anatidae.

P. borealis shrimps in the south-eastern part of the Sea of Okhotsk were found to be parasitized by 9% by the isopod Bopyroides hippolytes. In the marsupium of two B. hippolytes there were found the hyperparasitic isopods, described herein as a new genus and species of Cabiropsidae. A cryptoniscid larva of B. tridentata differs from known species of Cabiropsidae by having three dents on the basal segment of antennula. Oral cone lies between basal segment of antennulae and directed forward. Telson without teeth, eyes absent. Pleopodae of three morphological types: PI—PI I; PIII—PV and PVI—PVII. Medioventral tubercles or spines are absent.

In Hypoderma bovis Degeer larva, which died at the stage of prepupa, 7 days after its pupation had started, actively feeding Fannia sp. larvae were found.

The genera Pegosomum Ratz, 1903 and Chaunocephalus Dietz,1909 are closely related taxons by their morphological and ecological characters. They were placed into different subfamilies due to a once admitted error in the diagnosis of the genus Pegosomum. After the diagnosis had been corrected the above genera were united into the subfamily Pegosominae Odhner, 1911 and the subfamily Chaunocephalinae Travassos, 1922 and the family Chaunocephalidae Travassos, 1951 were rejected. The genus Balfouria Leiper, 1908 and the species B. monogama, regarded as a form which appeared due to an unusual localization of Chaunocephalus ferox (Rud., 1975) and teratological variability, are reduced to synonyms of the species Ch. ferox and the genus Chaunocephalus, respectively; the subfamily Balfouriinae Yamaguti, 1958 and the family Balfouriidae Travassos, 1951 are supressed.

Parasitic larvae of 30 strongylid species of horses out of 53 species known for the fauna of the USSR are identified. The paper presents descriptions of 7 earlier unknown phenones of parasitic late 4th-stage larvae, the specific belonging of which in not yet ascertained. The possibility of their identification is discussed.

The presence of Prosthodendrium dollfusi sp. n. and Acanthatrium ovatum Yamaguti, 1939, parasites of bats, in the Fas East of the USSR was established experimentally. Studies of the life cycles of the above trematodes have shown that their first intermediate hosts are molluscs of the genus Juga, the second ones for P. experimentatum sp. n. are May-flies, Ecdyonurus aurarius, and for A. ovatum are caddis-flies, Semblis atrata (experimentally). Under natural conditions metacercariae of both trematodes were recorded in Paragnetina flavotincta stoneflies.

Opechona bacillaris is first reported from the region of the Whale Ridge from the mesobenthic fish Helicolenus tristanensis (20%; 1 to 5 specimens/fish), which represents a new host record. A brief description of the species in given. The ways of distribution of O. bacillaris into the deep-water ocean space are discussed. A new name, O. ahmadi Gajevskaja, nom. nov., is proposed for O. siddiqi Ahmad, 1986 nom. preoc., nec O. siddiqi Ahmad, 1984.

The new species Trochopus antigoniae from the gills of Antigonia rubescens of the South-Chinese Sea is described and figured. Information on the composition and occurence of species of the genus Trochopus is given.

The primitive heteroderid genus Thecavermiculatus is recorded for the first time from the USSR. The description of T. crassicrustata in Kamchatka (plant hosts are Mertensia maritima and Lathyrus maritimus) and in the Maritime Province (plant hosts are Leymus mollis and Hierochloe glabra) is given.

Summary is absent.

Summary is absent.

Summary is absent.