Potamorrhaphis is a genus of freshwater needlefishes native to South America.
Species Four recognized species are in this genus: Potamorrhaphis eigenmanni A. Miranda-Ribeiro, 1915 Potamorrhaphis guianensis (Jardine, 1843) Potamorrhaphis labiatus Sant'Anna, Delapieve & R. E. dos Reis, 2012Sant'Anna, V.B., Delapieve, M.L.S. & Reis, R.E. (2012): A New Species of Potamorrhaphis (Beloniformes: Belonidae) from the Amazon Basin. Copeia, 2012 (4): 663-669. Potamorrhaphis petersi Collette, 1974
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