Figure 1. Lateral views of holotype specimens of species of Shamolagus, Gobiolagus and Desmatolagus that are housed in the AMNH collection. 1. Gobiolagus tolmachovi (AMNH 26142, left mandible with p3-m3); 2. G. andrewsi (AMNH 26091, right mandible with p3-m3); 3. G. major (AMNH 26098, right mandible with p4-m3); 4. G. burkei sp. nov. (AMNH 141275, right mandible with p3-m3); 5. Shamolagus medius (AMNH 26144, right mandible with p3-m1); 6. S. grangeri (AMNH 26289, left mandible with p4-m3); 7. Desmatolagus vetustus (AMNH 26089, right mandible with p3-m3); 8. D. ardynense (AMNH 20373, left mandible with p4-m2); 9. D. gobiensis (AMNH 19102, right mandible with p3-m3).