Ivanilza Da Silveira Silva, Acácio Freitas Nogueira, Andre Luiz Netto-Ferreira, Alberto Akama & Guilherme Moreira Dutra,

Abstract
A new species of Hemiodus is described from the Rio Xingu basin, Pará, Brazil. It is distinguished from congeners by the combination of presence of a dark longitudinal stripe extending from head to tip of lower caudal-fin lobe, an oblique blotch on dorsal-fin, 9–11 scale rows above lateral line, 58–66 perforated lateral line scales, and 17–20 circumpeduncular
scales. Comments on the conservation status of the new species, as well as its relationships among Hemiodus species, are made.

Link: https://www.biotaxa.org/Zootaxa/article/view/zootaxa.4751.1.11

Upper : Hemiodus tucupi, MPEG 36362, holotype, 66.5 mm SL, Igarapé Bacajaí, Rio Xingu basin, Pará, Brazil.        Lower: Hemiodus tucupi, live specimen, paratype, INPA 43494, 62.7 mm SL, Rio Xingu at middle portion of Volta Grande, Pará, Brazil. Photo by Mark Sabaj.