Abstract
A new species of parasitic nematode, Ascarophis (Similascarophis) richeri sp. nov. (Cystidicolidae), is described from the stomach of the marine scorpaeniform fish Hoplichthys citrinus Gilbert (Hoplichthyidae) (prevalence 19%, intensity 1–8 nematodes per fish) collected in the region of the Chesterfield Islands (Coral Sea, west of New Caledonia) in October 2005. The new species, studied using both light and scanning electron microscopy, is characterized mainly by the structure of the mouth (highly reduced pseudolabia, high pseudolabial terminal projections, no submedian labia, well-developed, bilobed sublabia), bifurcate deirids, the length of the spicules (663–729 μm and 105–108 μm) and the presence of filaments on both egg poles (2–5 on each). Similascarophis Muñoz, González et George-Nascimento, 2004 is considered a subgenus of Ascarophis van Beneden, 1871 to accommodate the species characterized by highly reduced pseudolabia. Presence of the new species in fish from Seamount Nova (Lord Howe Rise) but not from the Chesterfield plateau suggests that it is endemic to this seamount, a case already encountered for many benthic invertebrates.
Résumé
Une nouvelle espèce de Nématode parasite, Ascarophis (Similascarophis) richeri sp. nov. (Cystidicolidae), est décrite de l’estomac du poisson marin Hoplichthys citrinus Gibert (Scorpaeniformes, Hoplichthyidae) (prévalence 19%, intensité 1–8 nématodes par poisson) collecté en octobre 2005 dans la région des Îles Chesterfield (Mer du Corail, Ouest de la Nouvelle-Calédonie). La nouvelle espèce, étudiée au microscope photonique et au microscope électronique à balayage, est caractérisée principalement par la structure de la bouche (pseudolabia très réduites, terminaison des pseudolabia haute, pas de labia submédiane, sublabia bien développées et bilobées), des deirides bifurquées, la longueur des spicules (663–729 μm et 105–108 μm) et la présence de 2–5 filaments sur chaque pôle des œufs. Similascarophis Muñoz, González et George-Nascimento, 2004 est considéré comme un sous-genre de Ascarophis van Beneden, 1871, et inclut les espèces caractérisées par des pseudolabia très réduites. La présence de la nouvelle espèce dans des poissons provenant du mont sous-marin Nova (Ride de Lord Howe) mais pas du plateau des Chesterfield suggère qu’elle est endémique à ce mont, un cas déjà rencontré chez de nombreux invertébrés benthiques.
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Moravec, F., Justine, JL. A new species of Ascarophis (Nematoda, Cystidicolidae) from the stomach of the marine scorpaeniform fish Hoplichthys citrinus from a seamount off the Chesterfield Islands, New Caledonia. Acta Parasit. 52, 238–246 (2007). https://doi.org/10.2478/s11686-007-0026-z
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DOI: https://doi.org/10.2478/s11686-007-0026-z