A new species of Microglanis (Siluriformes: Pseudopimelodidae) from upper rio Paraná basin, Brazil

microglanis garavelloi, new species, collected in tributaries of rio paranapanema and rio tietê, is the first species of the genus described from upper rio paraná basin. the new species can be distinguished from other species of microglanis on morphometric characters, color pattern, caudal-fin shape, pectoral-spine morphology and lateral line development. characters used specifically to distinguish m. garavelloi from m. cottoides (laguna dos patos and rio uruguay basins) and m. parahybae (rio paraíba do sul basin) include morphometrics, color pattern and pectoral-spine serration.