Hasemania nana (Luetken, 1875)

Fig. 3K

Distribution.

Rio São Francisco basin.

Diagnosis.

Hasemania nana differs from Hasemania sp. by having 13-19 branched rays in anal fin and absence of rounded blotch in the median caudal fin rays.

Remarks.

Hasemania nana is an endemic species from the rio São Francisco basin. However, in the present study it was found in the rio Doce basin, confirming the first record of the species for this basin. The only difference observed in the specimens between both morphotypes is a tendency of higher number of anal fin rays in the specimens from the rio Doce basin (13-19 vs. 13-16). The higher number of anal fin rays is congruent to the H. nana morphotype from the rio Paraopeba (rio São Francisco basin).