51894 Priocharax pygmaeus Weitzman & Vari, 1987 Acestrorhamphidae American tetras Tyttobryconinae Characiformes Teleostei South America: Upper Amazon River basin in Colombia (Ref. 28825). Recorded from the río Ucayali basin in Peru (Ref. 96862). FB 2737335 Priocharax pygmaeus