Abstract
Two new species of the planktonic copepod genusTortanus, subgenusAtortus, are described from inter- to sub-tidal water of South Andaman Island, India. The new species are assigned to thetropicusgroup sensu Othman (1987) and distinguished from the other members of the group by the characteristic morphology of the pair of posterior dorsolateral processes on the fifth pedigerous somite in the female and the antennule and leg 5 in the male. An analysis of previous records of thetropicusspecies group indicates their sporadic occurrence combined with high species richness in Southeast Asia, suggesting future discovery of even more species by sampling with finer geographic and habitat coverage.
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