The list is based on an unpublished list, compiled by E. Karlsbakk, based on literature search and the Aquatic Sciences and Fisheries Abstracts. Almost exclusively original species descriptions have been used as the basis for species information. The preliminary list was then checked against other lists or sources: Gurley (1894), Thélohan (1895), Labbé (1899), Auerbach (1910), Kudo (1920), Shulman (1962), Shulman (1966), Naidenova et al. (1975), Donetz and Shulman (1984), Lom and Dyková (1992) and others. A total of 213 species are listed as valid, in addition, some important synonyms are included. It is likely that the actual number of species is much higher, since many fish species have never been examined. Also, many old myxozoan species described from several unrelated hosts will likely turn out to be complexes of sibling species (e.g. Myxidium oviforme).

The classification used is based on Lom and Dyková (1992). However, it differs in that; (a) the recent genus Polysporoplasma Sitjá-Bobadilla & Alvarez-Pellitero, 1995 is placed in family Sphaerosporidae and seems closely related to Sphaerospora Thélohan, 1892, (b) Genus Paramyxoproteus Wierzbicka, 1986 is considered as a synonym of Schulmania Kovaleva, Zubchenko & Krasin, 1983, (c) P. reinhardtii Wierzbicka, 1986 is a synonym of S. quadriolobata Kovaleva, Zubchenko & Krasin, 1983. The valid binomen for Sphaerospora caudata Parisi, 1910 is considered to be Hoferellus caudatus (Parisi, 1910) (large polysporic plasmodia, spore shape, posterior filaments).

Hosts are listed as valid genus or family of type host, and then other families or simply “other fishes” when the hosts are many and unrelated. When type hosts were not designated in the original description, the first listed is considered the type-host. Only the geographic distribution in the ERMS area is considered. However, several of the myxozoan species in the area are recorded also from, for instance, Australia and New Zealand.Abbreviations used at web site: GB, gall bladder; UB, urinary bladder; NE, northeast; NW, northwest; N, north and so on.

References

• Auerbach, M. 1910. Die Cnidosporidien (Myxosporidien, Actinomyxidien, Microsporidien). Eine Monographische Studie. Leipzig: Werner Klinkhardt. 261 pp.
• Donetz, E.S. & Shulman, S.S. 1984. 1984. Phylum cnidosporidians - Cnidosporidia
• Doflein, 1901, emend. Shulman & Podlipaev, 1980. In: Keys to the parasites of freshwater fishes in the USSR fauna. Vol. 1. Parasitic protozoa, pp. 88-251. S.S. Shulman, editor. Leningrad: Nauka. (in Russian)
• Gurley, R.R. 1894. Myxosporidia, or psorosperms of fishes, and the epidemics produced by them. Report to the U.S. Commissioner of Fish and Fisheries for 1892. 1892: 65-304.
• Kudo, R. 1920. Studies on Myxosporidia. A synopsis of genera and species of Myxosporidia. Illinois Biological Monographs 5: 239-503.
• Labbé, A. 1899. Sporozoa. Das Tierreich. Vol. 5. Berlin: Deutsche Zool. Gesellsch. 180 pp.
• Lom, J. & Dyková, I. 1992. Protozoan parasites of fishes. Developments in Aquaculture and Fisheries Science, Vol. 26. Amsterdam: Elsevier. 315 pp.
• Naidenova, N.N., S.S. Shulman and Z.S. Donetz. 1975. Class cnidosporidians -
• Cnidosporidia Doflein, 1901, emend. Shulman, 1967. In: Identification of the parasites of vertebrates in the Black- and Azov Seas, p. 20-50. A.V. Gaevskaya et al., editors. : Kiev: Akademiya Nauk Ukrainskoj SSR, "Naukova Dumka".(in Russian)
• Shulman, S.S. 1962. Order Myxosporidia Bütschli, 1881. Slime sporozoans. In: Key to parasites of freshwater fish of the U.S.S.R., p. 48-130. I.E. Bykhovskaya-Pavlovskaya et al., editors. Moscow-Leningrad: Izdatel’stvo Akademiya Nauk SSSR. (in Russian)
• Shulman, S.S. 1966. Myxosporidia of the USSR. Moscow: Akademiya Nauk SSSR, Zoologicheskii Institut. Nauka. 504 pp. (in Russian)
• Thélohan, P. 1895. Recherches sur les Myxosporidies. Bulletin scientifique de la France & de la Belgique 5: 100-394.

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