Ptychocharax is a monospecific genus of freshwater ray-finned fish belonging to the family Stevardiidae. The only species in the genus is Ptychocharax rhyacophila, a fish which is endemic to Venezuela, where it is found in the upper Siapa River.Thomaz, A.T., Arcila, D., Ortí, G. & Malabarba, L.R. (2015): Molecular phylogeny of the subfamily Stevardiinae Gill, 1858 (Characiformes: Characidae): classification and the evolution of reproductive traits. BMC Evolutionary Biology, (2015) 15: 146.
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