Moravec F. auteur aut IRD Justine Jean-Lou auteur aut IRD text journalArticle eng text/pdf reformatted digital access The cystidicolid nematode Metabronema magnum (Taylor, 1925) is redescribed from specimens collected from the swimbladder of the fish (golden trevally) Gnathanodon speciosus (Forsskal) (Carangidae, Perciformes) off New Caledonia, South Pacific (a new geographical record). The light and scanning electron microscopical examination made it possible to study in detail the morphology of this so far little-known species. Its pseudolabia were found to possess distinct anterior protrusions (protuberances), sublabia are absent, only four cephalic papillae are present, deirids are bifurcated, and the male possesses six pairs of postanal papillae. By its morphology, M. magnum seems to be most similar to species of Salvelinema Trofimenko, 1962, also from the swimbladder of fishes, differing from them mainly in the presence of median wedge-shaped outgrowths in the mouth, lateral alae, the longer spicule on the right side, and a fewer number of pairs of preanal papillae in the male. Since the morphology of M. magnum considerably differs from that of other representatives of the Cystidicolidae, Metabronema in Rasheed's (1966) conception is considered a valid genus. specialized parasitic nematode Metabronema morphology marine fish Gnathanodon New Caledonia 034 54 4 293-300 2007 0015-5683 https://www.documentation.ird.fr/hor/fdi:010042452 0015-5683 [F B010042452] https://www.documentation.ird.fr/hor/fdi:010042452 https://horizon.documentation.ird.fr/exl-doc/pleins_textes/divers17-09/010042452.pdf IRD - Base Horizon / Pleins textes 2008-05-30 2017-10-03 fdi:010042452 fre