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A new species of Tortanus (Atortus ) (Copepoda, Calanoida, Tortanidae) from the coastal waters of Nha Trang, Vietnam

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A new species of the copepod genus Tortanus, subgenus Atortus, is described from the coastal waters of Nha Trang, Vietnam. The new species is assigned to the tropicus species group sensu Othman (1987) and distinguished from the other members of the group by the morphology of the processes on the fifth pedigerous somite and the genital somite in the female, and the antennule and leg 5 in the male. An analysis of previous records of Atortus indicates highly sporadic occurrence, but a large number of species to be distributed in Southeast Asia. This obviously suggests future discovery of even more species, and also the need for sampling with better geographic and ecological coverage in this particular region. Une nouvelle espèce du genre de copépode Tortanus, du sous-genre Atortus, est décrite des eaux côtières de Nha Trang, Vietnam. La nouvelle espèce est attribuée au groupe d'espèces tropicus sensu Othman (1987) et se distingue des autres membres du groupe par la morphologie des processus situés sur le somite portant la cinquième patte et le somite génital chez la femelle, et par l'antennule et la cinquième patte chez le mâle. Une analyse des précédents signalements de Atortus indique une présence hautement sporadique, mais un grand nombre d'espèces réparties dans le sud-est asiatique. Ceci suggère clairement la découverte future de plus nombreuses espèces, et aussi la nécessité d'un échantillonnage réalisé avec une meilleure couverture géographique et écologique dans cette région particulière.


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