Hypostomus cf. plecostomus presented a system of multiple NORs identified at the
telomeric position on the long arm of pair 27 (a) and the short arm of pair 21 (st); the latter
showed an NOR size heteromorphism between homologs (Figure 2A and B). The AgNORs
and CMA3 sites were positive (Figure 3A) and negative for DAPI (Figure3B).