The fish fauna of the upper Piraí drainage, a transposed mountain river system in southeastern, Brazil Author de Brito, Victor Author Buckup, Paulo Andreas text Check List 2019 2019-02-22 15 1 235 247 http://dx.doi.org/10.15560/15.1.235 journal article 10.15560/15.1.235 1809-127X Hypostomus affinis ( Steindachner, 1877a ) Figure 4E Geographic distribution: Paraíba do Sul and Doce river basins and coastal rivers of southeastern Brazil . Diagnosis: Individuals of Hypostomus affinis can be distinguished H. luetkeni by the presence of 1 main postsupraoccipital plate and 4 lateral ridges on flanks ( Mazzoni et al. 1994 ). The prevailing pigmentation pattern in adults of H. affinis comprises numerous black spots, whereas H. luetkeni has a more uniform dark pigmentation pattern.