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A new   Diaptomidae   species is presented from the Neotropical region. It was found in two Amazonian lakes, Ressaca and Arapujá, both in Pará State, Brazil. The lakes are 400 km apart and threatened by the building of reservoirs for hydropower generation and pollution by human settlements. The new species resembles    N.   paraensis    Dussart &amp; Robertson, 1984, but it can be distinguished from this species and other congeners in having a special process on the fifth leg basis of the male, by the place of insertion of lateral spine in the last segment of right  P5  of male, the shape and relationship between length and width of segments of male and female  P5  exopodite 2 with stout inner process bearing short setules and outer small spine, exopodite 3, with two terminal setae, outer smaller; endopodite 1-segmented with one subterminal seta and oblique comb of spinules, the presence of a line of dorsal spinules at the distal margin of thoracic somites in both sexes. A brief comparison with other    Notodiaptomus    species is presented in the discussion.

A new species of Notodiaptomus from the Amazon basin ( Crustacea , Copepoda , Calanoida , Diaptomidae )