Fresh-water Shrimps (Crustacea, Decapoda, Natantia) of the Orinoco Basin and the Venezuelan Guayana

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Abstract
Shrimps of the families Sergestidae and Palaemonidae collected in the Orinoco basin, the upper Cuyuni River, and the upper and lower Rio Negro, are treated. New records and comments are given for Acetes paraguayensis, Macrobrachium amazonicum, M. brasiliense, M. jelskii, M. nattereri, M. surinamicum and Palaemonetes carteri. Two new palaemonids are described: Macrobrachium cortezi, related to M. nattereri, from several localilties in the Orinoco River and upper Rio Negro, and M. aracamuni, from an altitude of 680 m in the the Cerro Aracamuni in the drainage area of the upper Rio Negro. Another previously undescribed species of Macrobrachium is recorded but not named due to the lack of mature males.

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