mountain degu

1990 [1936], James Frank Colyer (original author), A. E. W. Miles, Caroline Grigson (editors), Colyer's Variations and Diseases of the Teeth of Animals, 2003, Revised Edition, page 317, In Octodontomys gliroides (mountain degu), the buccal surfaces of the upper cheek teeth are progressively turned more and more distally from the distal to the mesial ends of the arches, with P⁴ being nearly transverse to the line of the arch (Fig. 14.3).