The ichthyofauna of a poorly known area in the middle-southern Espinhaco mountain range, state of Minas Gerais, Brazil: diagnostics and identification keys Author dos Santos, Sergio Alexandre https://orcid.org/0000-0003-4340-4139 Museu Nacional, Universidade Federal do Rio de Janeiro, Departamento de Vertebrados, Quinta da Boa Vista s / n. CEP 20.940 - 040, Rio de Janeiro, RJ, Brazil sergio.pisces@gmail.com Author de Britto, Marcelo Ribeiro Museu Nacional, Universidade Federal do Rio de Janeiro, Departamento de Vertebrados, Quinta da Boa Vista s / n. CEP 20.940 - 040, Rio de Janeiro, RJ, Brazil text ZooKeys 2021 2021-08-03 1054 25 66 http://dx.doi.org/10.3897/zookeys.1054.67554 journal article http://dx.doi.org/10.3897/zookeys.1054.67554 1313-2970-1054-25 BAEC60898F874A56BAD08E2922E22F60 C0E2746E8DE65F77826FCC7FF2B54A4C Deuterodon giton Eigenmann, 1908 Fig. 3G Distribution. Rio Paraiba do Sul, Brazil. Diagnosis. Deuterodon giton differs from its congeners of the study area by having dentary teeth decreasing gradually in size until the sixth or seventh tooth; dentary with more than five cusps (usually seven or eight); infraorbital 3 totally exposed, with almost no naked area prior to preopercle; infraorbital 3 shiny due to high concentration of guanine crystals and low concentration of chromatophores. Remarks. Deuterodon giton is described from the rio Paraiba do Sul basin. However, in the present study it was found in the rio Doce basin, confirming the first record of the species for this basin. The difference observed in the specimens between both morphotypes is a tendency of longer length in adult specimens from the rio Paraiba do Sul basin.