Karyomorphs | Chromosome number | Sex Chromosomes | Geographic occurrence |
---|---|---|---|
Group I: first chromosome pairs of similar sizes | |||
Karyomorph A | 2n = 42 | - | Northen to southern Brazil, Uruguay and northen Argentina |
Karyomorph B | 2n = 42 | XX/XY | Vale do Rio Doce (Minas Gerais State) and Iguaçú River (Paraná State, Brazil) |
Karyomorph C | 2n = 40 | - | Northen Brazil to northen Argentina |
Karyomorph D | Female - 2n = 40/Male - 2n = 39 | X1X1X2X2/X1X2Y | Upper Paraná hydrographic basin, Brazil |
Group II: first chromosome pairs with clearly distinct sizes | |||
Karyomorph E | 2n = 42 | - | Trombetas River (Paraná State, Brazil) |
Karyomorph F | 2n = 40 | - | Surinam to southeastern Brazil |
Karyomorph G | Female - 2n = 40/Male - 2n = 41 | XX/XY1Y2 | Amazonian Rivers, Brazil |