FIGURE 1. Dental terminology used in this paper (after Topachevsky, 1969; Sarica and Şen, 2003): 1, hypocone; 2, hypoconid; 3, posterior collar; 4, mesocone; 5, mesoconid; 6, metacone; 7, metaconid; 8, paracone; 9, anterior collar; 10, protocone; 11, protoconid; 12, entoconid.

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FIGURE 2. Ultrastructure of the right M1 enamel of †Anomalomys gaillardi from the late Miocene (MN 9) of Grytsiv, Ukraine (NMNHU-P 22/2417).

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FIGURE 3. Ultrastructure of the left M2 enamel of †Anomalomys gaillardi from the late Miocene (MN 9) of Grytsiv, Ukraine (NMNHU-P 22/2548).

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FIGURE 4. Ultrastructure of the left m1 enamel of †Anomalomys gaillardi from the late Miocene (MN 9) of Grytsiv, Ukraine (NMNHU-P 22/2261).

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FIGURE 5. Ultrastructure of the left m2 enamel of †Anomalomys gaillardi from the late Miocene (MN 9) of Grytsiv, Ukraine (NMNHU-P 22/2326).

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FIGURE 6. Ultrastructure of the right m3 enamel of †Anomalomys gaillardi from the late Miocene (MN 9) of Grytsiv, Ukraine (NMNHU-P 22/2392).

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FIGURE 7. Ultrastructure of the right M3 enamel of †Pliospalax macoveii from the early Pliocene (MN 14) of Krasnopol, Ukraine (NMNHU-P 37/325).

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FIGURE 8. Ultrastructure of the right M3 enamel of †Pliospalax odessanus from the middle Pliocene (MN 15) of Odesa Catacombs, Ukraine (NMNHU-P О/1328).

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FIGURE 9. Ultrastructure of the right M2 enamel of †Spalax minor from the late Pleistocene (MQR 8) of Tarkhankut, Crimea, Ukraine (NMNHU-P 50/1302).

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FIGURE 10. Ultrastructure of the right M3 enamel of recent Spalax microphthalmus from Ukraine (NMNHU-P 4839).

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FIGURE 11. Ultrastructure of the right M3 enamel of recent Spalax leucodon from Ukraine (NMNHU-P 2238/6).

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