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As a part of the routine neritic zooplankton collection program in Obhur Creek (central Red Sea, Saudi Arabia), specimens of a pontellid calanoid copepod,    Calanopia   media    Gurney, 1927, were observed and studied. Since the original description was rather brief and drawings limited, especially of mouthparts and legs, which were not illustrated and described, the species is here fully redescribed. Red Sea specimens showed considerable variation in the female genital compound somite, the right caudal ramus and leg 5, as well as in the presence of a medial knob ventrally on the male right prosomal corner. DNA sequences of  mtCOI  of different specimens did not show any significant differences and supported their identity as one species.    Calanopia   media    exhibited clear diel vertical migration, with high densities of 106 and 150 ind. m -3  during sunset (6:00 pm; UTC+3) and midnight (12:00 am; UTC+3) collections, respectively. However, this species was not observed in other zooplankton collections from the surface to 20 m depth, at 6:00 am and 12:00 pm (UTC+3).

zookeys

New morphological and molecular data on the little-known pontellid    Calanopia   media    Gurney, 1927 (  Crustacea  ,   Copepoda  ,   Calanoida  ) from the Red Sea, with notes on its diel vertical distribution