The genetic distances (Dxy) between groups of the genus <i>Simocephalus</i> based on the COI gene.

<p>1–20 indicate groups of <i>Simocephalus</i>: 1, <i>Simocephalus</i> cf. <i>vetulus</i> from China and Taiwan; 2, <i>S. vetulus</i> from Europe; 3, <i>Simocephalus</i> cf. <i>vetulus</i> from Europe; 4, <i>S. vetuloides</i> from China; 5, <i>S. beianensis</i> from China; 6, <i>S. sp.</i> from North America; 7, <i>S.</i> cf. <i>punctatus</i> from North America; 8, <i>S.</i> cf. <i>mixtus</i> from North America; 9, <i>S. himalayensis</i> from China; 10, <i>S.</i> cf. <i>congener</i> from Europe; 11, <i>S. congener</i> from Europe; 12, <i>S. himalayensis microdus</i> from China; 13, <i>S. exspinosus</i> from Europe; 14, <i>S.</i> cf. <i>exspinosus</i> from Europe; 15, <i>S. sibiricus</i> from China; 16, <i>S.sp</i> = <i>S. serrulatus</i> form Taiwan in Young et al. 2012; 17, <i>S. heilongjiangensis</i> from China and Taiwan; 18, <i>S. serrulatus</i> from North America, China and Europe; 19, <i>Daphnia</i> cf. <i>similoides</i> from China (outgroup); 20, <i>Diaphanosoma dubium</i> from Taiwan (outgroup).</p><p>Intra-group and inter-group genetic distances of the 20 groups involved 132 nucleotide sequences. The standard deviations (SD) are shown in the upper diagonal of the matrix and the right column. Analyses were conducted using the Kimura 2-parameter model.</p><p>The genetic distances (Dxy) between groups of the genus <i>Simocephalus</i> based on the COI gene.