Priocharax piagassu is a minute species of fish native to the Rio Purus and Solimões Draina, Brazil. The species, which has a skeleton of cartilage, is almost completely transparent.Giovanna Guimarães Silva Lopez, Camila Silva Souza, Lais Reia, Larissa Arruda Mantuaneli, Bruno Ferezim Morales, Flávio Cesar Thadeo Lima, Claudio Oliveira & George Mendes Taliaferro Mattox (2025). Two New Species of Miniature Tetras of the Genus Priocharax (Teleostei: Characiformes: Acestrorhamphidae) from the Rio Purus and Solimões Drainages, Amazonas, Brazil. Taxonomy 5(3): 36. DOI: 10.3390/taxonomy5030036Mattox, G.M.T., F.C.T. Lima, R. Britz, C.S. Souza and C. Oliveira, 2024. Two new miniature species of the fish genus Priocharax from the Rio Tapajós and Amazonas drainages, Pará, Brazil (Teleostei: Characiformes: Characidae). Vertebrate Zoology 74:533-550.
Size This species reaches a length of .
Etymology The fish's name comes from Nheengatu, an Indigenous language in Amazonas, Brazil, in which pid means "heart" and wa'su means "big," i.e., the "big heart", which is the region in the middle of the Amazon basin where the type specimens were collected.
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