Redescription of Metabronema magnum (Nematoda: Cystidicolidae), a swimbladder parasite of the carangid fish Gnathanodon speciosus off New Caledonia
2007
Moravec, F.,Akademie Ved, Ceske Budejovice (Czech Republic). Parazitologicky Ustav | Justine, J.L.,Institut de Recherche pour le Developpement, Noumea (New Caledonia). Equipe Biogeographie Marine Tropicale
The cystidicolid nematode Metabronema magnum is redescribed from specimens collected from the swimbladder of the fish Gnathanodon speciosus 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, 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.
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