PotamorrhaphisPotamorrhaphis is a genus of freshwater needlefishes native to South America.SpeciesFour recognized species are in this genus:Potamorrhaphis eigenmanni A. Miranda-Ribeiro, 1915Potamorrhaphis guianensis Potamorrhaphis labiatus Sant'Anna, Delapieve & R. E. dos Reis, 2012Potamorrhaphis petersi Collette, 1974