. Bulletin. Natural history; Natuurlijke historie. EARLY CENOZOIC MAMMALIAN FAUNAS, FAYUM 37. FIGURE 2. Teeth of Phiomys andrewsi, X 10. A. Left , YPM 1802L B. Left dP,-M,, YPM 18043. C. Left ^^-^ YPM 18051. D. Right M», YPM 18035, anterior end to the right. E. Cross section of left L, AMNH 13724. F. Occlusal sur- face of right L, YPM 18064. G. Occlusal surface of right Ij, AMNH 13271. H. Cross section of left Ii, YPM 18071. I. Cross section of right P, YPM 18199. J. Occlusal surface of left P, YPM 18199. K. Lateral view of same specimen, YPM 18199. margin of the tooth as an anterior cingu
. Bulletin. Natural history; Natuurlijke historie. EARLY CENOZOIC MAMMALIAN FAUNAS, FAYUM 37. FIGURE 2. Teeth of Phiomys andrewsi, X 10. A. Left , YPM 1802L B. Left dP,-M,, YPM 18043. C. Left ^^-^ YPM 18051. D. Right M», YPM 18035, anterior end to the right. E. Cross section of left L, AMNH 13724. F. Occlusal sur- face of right L, YPM 18064. G. Occlusal surface of right Ij, AMNH 13271. H. Cross section of left Ii, YPM 18071. I. Cross section of right P, YPM 18199. J. Occlusal surface of left P, YPM 18199. K. Lateral view of same specimen, YPM 18199. margin of the tooth as an anterior cingulum. The ectolophid is long and slender, with a slight swelling marking the position of the mesoconid. In the holotype, there is a small, low swelling in the talonid basin, indicating the mesolophid. This is absent in YPM 18071, where there is a short crest from the mesoconid. The entoconid unites with the hypoconid through the posterior cingulum, which has enlarged to form a well-developed hypoconulid. The entoconid is rounded. This tooth is quite different in pattern from the molars. All the lower molars agree in their basic pattern (fig. 1 B-H, 2 A, B). There is a crest along the anterior margin of the tooth, connecting the metaconid with the anterior arm of the protoconid. There is a small anterior cingulum on the buccal side of the tooth, which extends a variable distance across the anterior face of the tooth as a very faint ridge. At least in part, its length is an age char- acteristic, interdental wear resulting in its progressive elimination. The ecto- lophid is strong, connecting with a buccal crest from the entoconid and the an- terior arm of the hypoconid, except in YPM 18021 (fig. 2 A), where the hypolo- phid is interrupted. The hypoconid extends into the posterior cingulum, which expands to form a hypoconulid of rather variable size. The tip of the posterior cingulum unites with the base of the entoconid. The hypoconid is generally ex- tended forward along the buc
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