Average number of nucleotide differences between ITS1 dataset sequences of closest related groups of <i>Sphaerium</i> spp. with pairwise deletion of gaps/missing data and inclusion of all substitutions (transitions and transversions).

<p>Average number of nucleotide differences between ITS1 dataset sequences of closest related groups of <i>Sphaerium</i> spp. with pairwise deletion of gaps/missing data and inclusion of all substitutions (transitions and transversions).