DIGITAL REPOSITORY of VOUCHER SPECIMENS

Figure S5. Relative age groups of the analysed specimens of Alticola argentatus: (A) ZIN 77405; (B) ZIN 77458; (C) ZIN 77464; (D) 77489. Skulls are shown in lateral (top) and dorsal (bottom) view. Scale bars are 5 mm; skulls are shown at the same scale. Key: a, line together with arrow 'b' marks differences between mature and immature specimens; b, arrow marks condylar position in mature vs immature specimen; c, line marks the profile of the zygomatic arch in a mature specimen compared to an immature specimen; d, temporal line in mature specimen.

Figure S6. Relative age groups of the analysed specimens of Alticola lemminus: (A) ZIN 101796; (B) ZIN 101797. Skulls are shown in lateral (top) and dorsal (bottom) views. Scale bars are 5 mm; skulls are shown at the same scale. The age group was determined with the aid of A. argentatus age attribution (see Fig. S5).

Figure S7. Relative age groups of the analysed specimens of Alticola macrotis: (A) ZIN 102289; (B) ZIN 102307; (C) ZIN 99351. Skulls are shown in lateral (top) and dorsal (bottom) views. Scale bars are 5 mm; skulls are shown at the same scale. The age group was determined with the aid of A. argentatus age attribution (see Fig. S5).

Figure S8. Relative age groups of the analysed specimens of Alticola semicanus: (A) ZIN 107067; (B) ZIN 107068. Skulls are shown in lateral (top) and dorsal (bottom) views. Scale bars are 5 mm; skulls are shown at the same scale. The age group was determined with the aid of A. argentatus age attribution (see Fig. S5).