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Examination of 116 individuals of Perccottus glenii from water bodies of Primorsky Territory of Russia (the Khanka Lake basin and the Peter the Great Bay basin) revealed the presence of 35 species/taxa of parasites. We give a description of a new species, Myxidium shedkoae sp. nov. Spherical plasmodoa of M. shedkoa sp. nov. are located in the gall bladder; spores are fusiform, with protrusive, pointed, or truncated-cone-shaped poles. The length of spores constitutes 12.6-14.9 (13.4) microm; width, 7.1-8.6 (7.9) microm; shell valves possess 8-10 ridges forming "papillary" pattern. Drawings and descriptions of parasites species poorly studied and recorded from Russia for the first time are given together with drawings and descriptions of some parasites determined only as genera: Triangula perccotti, Gyrodactylus sp., Phyllodistomum sp., Paracoenogonimus ussuriensis (metacercaria), Cyathocotylidae gen. sp. (metacercaria) and Spiroxys japonicus (third-stage juvenile). Parasite fauna of P. glenii in Primorsky Territory comprises 66% of species/forms known for P. glenii in the native part of its range.

A critical review of modern studies on the life cycles of Myxozoa is presented. List of myxosporidian species with known life cycles is given.

Comparison of myxosporidian species compositions in different flatfish species fro Peter the Great Bay showed that the flatfishes should be divided into three ecological groups--deep water (scaly-eyed plaice Acanthopsetta nadeshnyi, Korean flounder Glyptocephalus stelleri, flatheaded flounder Hippoglossoides dubius, and pinewood flounder Cleisthenes herzensteini), relatively coastal (yellow-finned sole Limanda aspera and brown sole Pseudopleuronectes herzensteini), and coastal (Japanese flounder Pseudopleuronectes yokohamae, long-snouted flounder Limanda punctatissimus, starry flounder Platichthys stellatus, and white-bellied flounder Lepidopsetta mochigarei). This division coincides in general with the previously proposed ecological classification based on the characteristics of bathymetric distribution and preference to water layers during summer period in the fishes.

The complete taxonomic composition (158 species of freshwater Myxosporea inhabiting European Part of Palaearctic is presented. Their distribution by faunistic complexes and groups is established. Analysis of similarity between myxosporean faunas by zoogeographical areas and districts is carried out. Historical background of the distribution and formation of the freshwater myxosporean fauna is discussed.

Data on species composition, hosts, localities, and occurrence of myxosporidean in four host species of the scorpionfish genus Sebastes from different areas of North Atlantic and Barents Sea are presented. Thirteen myxosporidean species are recorded.