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Karyotype of Characidium cf. zebra showing the 5S rDNA on pair 17, typical of the populations from the Alambari, Novo and Araquá rivers (a); in pairs 1, 6 and one homologue of pair 17, from the Paraitinguinha river (b) and in pairs 1, 6, 9, 17 and 18 from the Juba river (c). In (d), the karyotype present in the five populations of Characidium cf. zebra with the 18S rDNA on pair 23. Bar = 10 μm.
