Neighbor-Joining tree and haplotype network of <i>Nannostomus</i> species showing distinct lineages: (A) <i>N</i>. <i>eques</i>, (B) <i>N</i>. <i>unifasciatus</i>, (C) <i>N</i>. <i>digrammus</i> and (D) <i>N</i>. <i>trifasciatus</i>.

<p>In the network each circle represents one haplotype, and theize of the circles is proportional to the haplotype frequency. Color codes represent the lineages found in <i>Nannostomus</i>. Numbers on the lines represent the mutational steps between haplotypes.