Fig. 9. Xaymaca fulvopulvis AMNHM 268011 in A Possible Heptaxodontine and Other Caviidan Rodents from the Quaternary of Jamaica

Fig. 9. Xaymaca fulvopulvis AMNHM 268011 (holotype, top) compared to jaw of Jamaican capromyid Geocapromys brownii AMNHM 45156 (bottom), stereopairs of occlusal aspect of left mandible, photographed in ordinary light (note difference in 1 mm scales). The worn p4 of the Xaymaca holotype is uncoated in this figure (cf. fig. 8), revealing small­scale features. Note sharp boundary (feature 1) between dark dentinal core of tooth and thin, light outer layer of cementum that encircles it (closeup of this boundary can be seen in fig. 16B). Features 2 and 3 are possibly sections of the pulp chamber, seen through translucent dentine on the p4 trituration surface (cf. fig. 16D). Geocapromys brownii conspicuously differs from Xaymaca in alveolar orientation and internal ornamentation of tooth sockets (cf. empty p4 alveolus). Geocapromys and the endemic sigmodontine Oryzomys antillarum are the only other rodents represented in Pleistocene levels at Drum Cave.