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Polyclithrum ponticum sp. n. is described and P. mugilini Rogers, 1967 is redescribed. Both monogenean species are parasites of Mugil cephalus in the Black Sea. The new species differs from P. mugilini, P. alberti and P. boegeri by the lesser size of anchors, while it is distinguished from P. corallense by the larger size of these structures. P. ponticum sp. n. differs from all formerly described species by the greater length of dorsal connective bar. In both species from the Black Sea, "ear-like" structures situated near the external roots of anchors are described for the first time. It is suggested, that these structures take part in longitudinal, two-lobe folding of the haptor. The process of opening the haptor is probably performed by the additional bars of the haptor (bars 2 and 3 after: Rogers, 1967), joined to each other and with the anchors. The fifth pair of additional bars (Ernst e. a., 2000) derives from the "beard" of ventral connective bar and is united with its basal part. The sixth pair of additional bars (Ernst e. a., 2000) is considered as a typical "ribs" of the haptor, and therefore the "ribs" are represented by three pairs. Differences between marginal hooks of P. ponticum sp. n. and P. mugilini are insignificant, that probably depends on the presence of "ribs" of the haptor. Based on the subdivision of marginal hooks into two groups, the presence of additional supporting structure in the haptor, and the presence of the seminal receptacle, it is suggested that the subfamily Polyclithrinae Rogers, 1967 should include the genera Polyclithrum Rogers, 1967, Swingleus Rogers, 1969, Macrogyrodactylus Mamlberg, 1959, and probably Fundulotrema Hargis, 1955. Based on such characters as the lack of the anchors, the presence of suckers in the haptor, and ovipositing of eggs, it seems to be expedient to use the following taxa in systematics of gyrodactylids: Isancistrinae Fuhrmann, 1928 (genera Isancistrum, Anacanthocotyle); Gyrdicotylinae Vercammen-Grandjean, 1960 (Gyrdicotyle) and Ooegyrodactylinae Harris, 1983 (genera Phanerothecium, Ooegyrodactylus, Nothogyrodactylus, Hyperopletes).

The additions concerning the morphological characters and measurements of Anomalotrema koiae, Helicometra fasciata, Accacladocoelium macrocotyle, A. petasiporum, and Paraccacladium jamiesoni have been made. Podocotyle atomon (Rud., 1802) in Gaevskaya, Umnova, 1977 described from Sebastes marinus from the northwest Atlantic is considered as Anomalotrema koiae. Helicometra fasciata is found in Mugilidae for the first time. Accacladocoelium macrocotyle and A. petasiporum are found in the new region--the Azores.

Three fish trematode species are found from the new hosts: Pseudobacciger harengulae in Sardina pilchardus and Sardinella aurita; Diphterostomum brusinae in Parapristipoma octolineata, Pagellus acarne and Umbrina canariensis; Lecithocladium angustiovum in Pomadasys incisus caught in the East Atlantic. All species were found in the new localities. Some characters of D. brusinae morphology are detailed. Measurements of trematode species from different hosts are given. Key to species of genus Pseudobacciger in proposed.

Four new species of trematodes are described from fishes of the Falkland--Patagonian region as follows: Infundibulostomum patagonicum from Notothenia ramzay; Stenacron mancopsetti from Mancopsetta maculata; Neolepidapedon argentinensis from Salilota australis; Hirudinelloides elongatus from Thyrsites atun. For the latter species a new genus, Hirudinelloides, has been erected. Representatives of the genera Infundibulostomum, Stenacron and Neolepidapedon are first reported from this region.

On the basis of the structure of the terminal parts of the genital system Hemiurus macrouri Gayevskaya, 1975 is transferred to the genus Glomericirrus. G. ulmeri Campbell and Munroe, 1977 is considered as a synonym of G. macrouri (Gayevskaya, 1975). It is noted that G. macrouri occurs but rarely (1.1%) in Coryphaenoides rupestris from the northern part of the Middle Atlantic ridge.

Davisia amoena sp. n. has been recorded from Hippoglossoides platessoides from northwestern Atlantic (in 36% of fishes). It differs from closely related D. longibrachia in the structure of vegetative forms, a smaller size of polar capsules and longer (1.5 times) lateral appendages. D. newfoundlandia Yoshino a. Noble, 1973 firstly recorded from Coryphaenoides holotrachys in the region of Falkland Islands (in 4.5% of fishes) is redescribed.

Two new species of Myxosporidia of the genus Myxoproteus from the Celtic Sea fishes are described. M. scoleciformis was found in the biliary bladder of the John dory, Zeus faber (on 1 from 4 fishes), M. formosus was found in the urinary bladder of the whiting Merlangius merlangus (on 2 from 9 fishes).

The significance of data on fish parasites was earlier considered by V. A. Dogel', S. S. Shul'man, S. M. Konovalov, and other Soviet parasitologists. These data are inadequately used by related disciplines. The possibility to use parasitological data for studying fish feeding pattern, peculiarities of their bathymetric distribution, migration routes, taxonomy, phylogenetic origin, and revealing the origin of marine basins and their ichthyofauna has been demonstrated.

Two new genera of the lepocreadiid trematodes, Gibsonia gen. n., (type species--G. hastata sp. n.) from Macrourus carinatus Günther, 1878 (Macrouridae), collected in the Falkland Islands area, and Muraenolepitrema gen. n. (type species--M. magnatestis sp. n.) from Muraenolepis microps Lönnberg, 1905 (Muraenolepidae), collected in the South Georgia Island area, are described. Gibsonia gen. n. differs from all known genera of the family Lepocreadiidae by unusual body shape divided into 2 parts, suctorial formations, great number of glandular cells and a muscular bulge of the body sides; it differs from the closely related genus Lepidapedon by separate genital pores. Muraenolepitrema gen. n. differs from Myzoxenus by bursa shape, separate genital pores, lobed shape of genital organs.