| Summary: | The shallow-water hydroids and hydromedusae from the fjords region of southern Chile are surveyed. A total of 63 species are described or mentioned. Of these, one species, Halecium fjordlandicum sp. nov., is new to science, five species could be identified to genus only, and one species, Hebella cf. dispolians (Warren, 1909), is only tentatively identified. The species have been assigned to nine families of athecates, 13 families of thecates, two families of narcomedusae and one family of trachymedusae. Among the present material, twenty species are new records for Chile: Bougainvillia muscoides (M. Sars, 1846), B. pyramidata (Forbes & Goodsir, 1851), Cordylophora caspia (Pallas, 1771), Hydractinia tenuis (Browne, 1902), Eudendrium cf. nambuccense Watson, 1985, E. cf. scotti Puce, Cerrano & Bavestrello, 2002, Calycella syringa (Linnaeus, 1767), Campanulina pumila (Clark, 1875), Egmundella gracilis Stechow, 1921, Lafoeina longitheca Jäderholm, 1904, Filellum cf. magnificum Peña Cantero, Svoboda & Vervoort, 2004, Hebella cf. dispolians, Sertularella argentinica El Beshbeeshy, 1991, S. fuegonensis El Beshbeeshy, 1991, S. gayi (Lamouroux, 1821), S. jorgensis El Beshbeeshy, 1991, Campanularia cf. hincksii Alder, 1856, Clytia linearis (Thornely, 1900), C. paulensis (Vanhöffen, 1910) and Cunina octonaria McCrady, 1859. A number of species show affinities partly with the cold-temperate Magellan region, and partly with Antarctica. The remaining species have either a cosmopolitan distribution, or are restricted to the temperate part of the southern hemisphere. Finally, several species have a bipolar distribution. Two species, Hydractinia pacifica Hartlaub, 1905 and Kirchenpaueria magellanica (Hartlaub, 1905) are here recorded for the first time from Chile since their original description. Phialella chilensis (Hartlaub, 1905) is regarded as a synonym of P. quadrata (Forbes, 1848), since there are available records of the medusa stage of the latter species from Chile. Some of the well-known species are listed ...
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