FIGURE 3. Variation in the morphology of Microtus sp. from Smith Creek Cave. A. Microtus sp. with five closed triangles (SCCAR-255). B. Microtus sp. with five closed triangles and confluent T1 and T2 (SCCAR-2). C. Microtus sp. with five closed triangles and a pinched T6 (SCCAR-9). D. Microtus sp. with five closed triangles, a pinched T6, and a T7 that is closed from the anterior cap (SCCAR-151). E. Microtus sp. with five closed triangles and a T6 with incipient closure (SCCAR-52). F. Microtus sp. with five closed triangles and secondary wings that are closed from the anterior cap (SCCAR-254). G. Microtus sp. with five closed triangles and secondary wings that are pinched from the anterior cap (SCCAR-166). H. Microtus sp. with five closed triangles and secondary wings with incipient closure from the anterior cap (SCCAR-16). I. Microtus sp. with six closed triangles. J. Microtus sp. with seven closed triangles (SCCAR-250). K. Microtus sp. with aberrant enamel pattern on T4 (SCCAR-115).