| description of two new sympatric species of the genus hisonotus eigenmann and eigenmann, 1889, from upper rio tapajós, mato grosso state, brazil (pisces: ostariophysi: loricariidae). | two new species of the genus hisonotus are described from the upper rio tapajós basin, mato grosso state, brazil. they are small species, growing up to about 30.0 mm sl, having the scapular bridge wide and totally exposed or having a small median pair of arrector fossae, and the abdomen completely covered with large plates in adult specimens (about 23.0 mm sl). they are distinguished from their congeners by the following combination of characters: hisonotus chromodontus has 20-40 reddish-brown t ... | 2007 | 18094823 |