Morphometric study of Calanus chilensis males along the Chilean coast

Two species of the Calanus helgolandicus species-group, C. chilensis and C. australis, have been reported for Chilean waters since their description by Brodsky (1959). Morphological differences between both species are slight and have been found only in males. We analyzed the morphometry of male copepods of C. chilensis from the Chilean and Peruvian coast and compared it with that of C. australis off New Zealand and Australia. Our results show that only C. chilensis occurs in the Pacific Coastal waters of South America between 10 degree S and 42 degree S.