Review of the genus Hypostomus Lacépède, 1803 from rio Ribeira de Iguape basin, with description of a new species (Pisces, Siluriformes, Loricariidae). Osvaldo T. Oyakawa Alberto Akama Angela M. Zanata Zootaxa 2005 921 1 27 4K2W5 Loricariidae Hypostomus CoL Animalia Siluriformes 25 Chordata species commersonii  Brazil. Rio Grande do Sul: - MZUSP 40957, 2, 270.8-284.2 mm SL; mouth of rio Santo Cristo, tributary to rio Uruguai, Porto Maua. - MZUSP 23629, 1, 148.1 mm SL; rio dos Sinos, SaoLeopoldo. - MZUSP 41075, 1, 194.0 mm SL; rio Uruguai, Irai. - MZUSP 41062, 3, 170.7-204.2 mm SL; rio Piratini, tributary of rio Uruguai, Fazenda dos Hinz, Santo Angelo.