Abstract

The first records of sympatric populations of the poorly studied sister species Brachyrhaphis roseni and Brachyrhaphis terrabensis are presented. Sympatric populations were found in a total of 14 localities in four river drainages throughout the Pacific slopes of western Panama, and they occurred in a wide range of elevations, from 90 to 651 m. These data expand the elevation range of each species, and provide the first case of sympatric sister species within the genus.

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