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Fig. S1 Examples of the morphological variation encountered in Parborlasia samples from the Antarctic Peninsula (a through d; haplotypes L1, A1, D1, and A2 respectively), Burdwood Bank (e; haplotype U8), and southeastern Argentina (f; haplotype O8). All of the specimens depicted here were included in the molecular analysis. Note the plasticity in pigmentation and the anterior banding pattern (i.e., the light coloured ‘collar’) between specimens. No obvious morphological differences were identified that corresponded with geography or the genetic differences reported in this study. Images are not to scale relative to one another.

Table S1 Haplotype name, collection information, and GenBank Accession nos for Parborlasia spp. samples from South America, Antarctica and the sub-Antarctic Islands. Station numbers 04-xx and 06-xx were collected on the 2004 and 2006 cruises aboard the R/V Lawrence M. Gould, respectively. Others were either obtained from the Icefish cruises (via S. J. Lockhart) or directly from GenBank (i.e., the McMurdo Sound sample).

Table S2 Collection information, age class, and GenBank Accession nos for nemerteans other than Parborlasia corrugatus from South America, Antarctica and the sub-Antarctic Islands. Station numbers 04-xx and 06-xx were collected on the 2004 and 2006 cruises aboard the R/V Lawrence M. Gould, respectively. Others were either obtained from the Icefish cruises (via S. J. Lockhart).

Table S3 Genetic-distance statistics for Parborlasia corrugatus mtDNA genes (16S, COI, and the third positions of COI).

Appendix S1 Supplementary results and discussion

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