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. 2021 Jun 29;18:34. doi: 10.1186/s12983-021-00418-9

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© The Author(s) 2021

Open AccessThis article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated in a credit line to the data.

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Fig. 3 — Neighbour joining cluster analyses (Sørensen dissimilarities) based on the occurrence of 471 genetic lineages. We used deeply divergent (i.e. old) genetic lineages (a–c; level I including 213 lineages) and such distinguished by shallow differentiations (i.e., referring to a younger time frame) (d–f, level II representing 258 lineages) for 78 species among 17 areas (A–S) as defined in Fig. 2. Trees in a and d are unrooted; in b and e rooted in the Po Plain; in c and f rooted in southern Sicily. Numbers show the percentage of bootstrapped trees (1,000 replicates) corroborating the focal split. Colours link areas consistently clustering together. The dark red square is highlighting the closest link of Sicily (M, N, O)