Table S1. Overview of the grouped sampling localities of Meriones meridianus considered in this study (*type locality of M. m. auceps).

Table S2. Definition and numbering of the landmarks used for the skull morph analyses.

Table S3. Euclidean distances between the M. meridianus groups means and the p-levels obtained from the Monte-Carlo randomization test (*p < 0.01, **p < 0.001).

Table S4. Variation in size variables per geographical group (for group numbers, see Table S1) (measurements in mm).

Table S5. List of specimens studied in this study and their voucher numbers.

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