Fig. 2 in A Possible Heptaxodontine and Other Caviidan Rodents from the Quaternary of Jamaica

Fig. 2. Cheektooth morphology in Puerto Rican heptaxodontine Elasmodontomys obliquus (after Anthony, 1918); despite orientation, both specimens are maxillary molars. In A, from a young animal, root is open and apical hypertrophy has not begun. In B, from an aged animal, attrition has substantially reduced original tooth length. However, attritional loss is partly compensated by apical hypertrophy at root end, so crown appears to be perched on stub of secondary dentine (arrow).