The long time known Corydoras spec. "Asher" or C. cf. or spec. aff. reynoldsi was described now as C. tukano. It is similar to C. reynoldsi and weitzmani but a distinct species.
Corydoras tukano, a new species of corydoradine catfish from the rio Tiquié, upper rio Negro basin, Brazil (Ostariophysi: Siluriformes: Callichthyidae)
Marcelo R. Britto and Flávio C.T. Lima
Neotropical Ichthyology 1(2): 83-91 from 2003.
For more info (first page) see: http://www.ufrgs.br/ni/vol1num2%5C1(2)artigo02.pdf