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

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 espece du genre de copepode Tortanus, du sous-genre Atortus, est decrite des eaux cotieres de Nha Trang, Vietnam. La nouvelle espece est attribuee au groupe d'especes tropicus sensu Othman (1987) et se distingue des autres membres du groupe par la morphologie des processus situes sur le somite portant la cinquieme patte et le somite genital chez la femelle, et par l'antennule et la cinquieme patte chez le mâle. Une analyse des precedents signalements de Atortus indique une presence hautement sporadique, mais un grand nombre d'especes reparties dans le sud-est asiatique. Ceci suggere clairement la decouverte future de plus nombreuses especes, et aussi la necessite d'un echantillonnage realise avec une meilleure couverture geographique et ecologique dans cette region particuliere.

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