Giemsa-stained karyotypes and chromosome pairs sequentially submitted the Ag-NOR. (A) L1- Laranjal do Jari/AP (ZUEC 19196, male), (B) L2- Prainha/PA (ZUEC 16512, male), (C) L3- Monte Alegre/PA (ZUEC 19916, male), (D) L4- Alenquer/PA (ZUEC 19932, female), (E) L5- Óbidos/PA (ZUEC 19914, male), (F) L6- Oriximiná/PA (ZUEC 19922, male), (G) L7- Belterra/PA (ZUEC 16506, male), (H) L8- Alta Floresta/MT (ZUEC 16406, male), (I) L9- Chapada dos Guimarães/MT (ZUEC 15886, male), and (J) L10- Santa Terezinha/MT (ZUEC 13503, male). The arrows indicate secondary constrictions. Insets (right) show NOR-bearing chromosomes. Chromosomes were sequentially impregnated by silver nitrate after standard staining in C-G. The arrowheads indicate NOR sites. Note the heteromorphic position of the NOR site in the karyotype from Alta/Floresta (H): pericentromeric in morph 8a and subterminal in morph 8b. Bar=3 μm.