Revision of the genus Pseudotocinclus (Siluriformes: Loricariidae: Hypoptopomatinae), with descriptions of two new species

the genus pseudotocinclus is revised and two new species are described: pseudotocinclus juquiae from the ribeira de iguape basin and pseudotocinclus parahybae from the rio paraíba do sul basin. the presence of a small naked area on the snout tip distinguishes p. tietensis from p. parahybae and p. juquiae, which have the snout tip covered with small platelets. in addition, p. tietensis has four transverse dark-brown bands on the dorsum coalesced with the midlateral stripe instead of three, as in its congeners. pseudotocinclus juquiae is distinguished from its congeners by having the orbital ring very prominent and conspicuous, a characteristic not found in p. tietensis or p. parahybae. these three species also differ from their congeners by meristic and morphometric data. comments on the past connection of ribeira de iguape, paraíba do sul and upper tietê basins are presented.