Deuterodon giton Eigenmann, 1908

dos Santos, Sergio Alexandre & de Britto, Marcelo Ribeiro, 2021, The ichthyofauna of a poorly known area in the middle-southern Espinhaco mountain range, state of Minas Gerais, Brazil: diagnostics and identification keys, ZooKeys 1054, pp. 25-66 : 25

Deuterodon giton Eigenmann, 1908

Fig. 3G

Distribution.

Rio Paraíba 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 Paraíba 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 Paraíba do Sul basin.

Figures

Figure 3. Characiformes species from the middle-southern Espinhaco mountain range, Minas Gerais state, Brazil A Hypomasticus thayeri, MNRJ 43577, 91.1 mm SL B Characidium fasciatum, MNRJ 48435, 68.8 mm SL C Characidium sp. A, MNRJ 46861, 65.5 mm SL D Characidium sp. B, MNRJ 48460, 56.2 mm SL E Characidium sp. C, MNRJ 46911, 42.3 mm SL F Astyanax lacustris, MNRJ 48521, 52.6 mm SL G Deuterodon giton, MNRJ 48129, 47.5 mm SL H Deuterodon intermedius, MNRJ 47840, 42.1 mm SL I Deuterodon pedri, MNRJ 48381, 65.5 mm SL J Deuterodon aff. taeniatus, MNRJ 45824, 55.5 mm SL K Hasemania nana, MNRJ 48440, 28.4 mm SL L Hasemania sp., MNRJ 48416, 25.1 mm SL M Oligosarcus argenteus, MNRJ 48393, 82.6 mm SL N Piabina argentea, MZUSP 110200, 44.2 mm SL O Psalidodon rivularis, MNRJ 48516, 46.8 mm SL P Psalidodon sp. MNRJ 48128, 59.4 mm SL Q Hoplias intermedius MZUSP 54696, 40.4 mm SL.