NOTES ON SOME BRYCON (PISCES, CHARACIFORMES, CHARACIDAE) FROM THE AMAZON, PARANA-PARAGUAY AND SOUTH-EASTERN BRAZIL SYSTEMS

Most of the types of the Brycon spp. from the river systems enumerated in the title have been studied, together with additional material from the Amazon and La plata system. From the Amazon basin, four species are recognized and redefined in the group with the well-known colour-pattern of B. melanopterus, viz. B. cephalus, B. melanopterus, B. bicolor and an undescribed species from the Rio Madeira basin. In Paraguay, two species have been recently collected and are redescribed, viz. Brycon orbignyanus and B. microlepis, often called B. hilarii by authors. It is shown that the true B. hilarii, together with B. opalinus and B. orthotaenia, are restricted to the South-East of Brazil.