Table S1. Taxonomic and systematic revisions for Austropotamobius pallipes (from Chiesa et  al. 2011, updated).

Table S2. Number of individuals (No.) collected in the sampling sites.

Table S3. Shape differences between populations by a series of pairwise Hotelling T2 tests.

Table S4. Differences in the lateral spine number: interpopulation chi-square values for right side are reported above the diagonal (grey squares) and those for left side below it; intrapopulation chi-square values are within grey squares (for acronyms see Table  S2).

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