Procheneosaurus altidens ( Lambe, 1902 )

Sahni, Ashok, 1972, The vertebrate Fauna of the Judith River formation, Montana, Bulletin of the American Museum of Natural History 147 (6), pp. 319-416 : 360-361

Procheneosaurus altidens ( Lambe, 1902)

Figure 8W, X

Trachodon (Pteropelyx) altidens LAMBE, 1902 , p. 76.

Procheneosaurus ? altidens: LULL AND WRIGHT, 1942, p. 222.

A crested ornithopod is indicated by a small group of teeth, AMNH 8527 from Clambank Hollow, which are markedly different from those of Kritosaurus (fig. 8W, X). The teeth are large, with a long, narrow and elongated enamel face having a prominently raised medial keel. Sides of the enamel face are ornamented toward the apex of the crown with small papillae. Unlike teeth of Kritosaurus , the crown is not diamondshaped but is rectangular in lateral view.

The teeth, which vary greatly in size, closely resemble teeth of Trachodon (Pteropelyx) altidens Lambe (1902 , pl. 4, fig. 4). The species was later tentatively transferred to the genus Procheneosaurus by Lull and Wright (1942, pp. 222-223).

Figures

FIG. 8. A. Chamops segnis. AMNH 8486, labial view of left dentary. B. Lingual view. Both x 5. C. AMNH 8488, lingual view of left maxilla. D. Labial view. Both x 5. E. cf. Xenosauridae, AMNH 8498, labial view of left maxilla. F. Lingual view. Both x 5. G. Peltosaurus piger, AMNH 8495, lingual view of left maxilla, x 5. H. AMNH 8494, lingual view of right dentary, x 5. I. Paraderma bogerti, AMNH 8504, lingual view of right maxilla. x 5. J. Parasaniwa wyomingensis, AMNH 8499, lingual view of left dentary, x 5. K. Leptochamops denticulatus, AMNH 8491, lingual view of right maxilla, x 5. L. Exostinus lancensis, AMNH 8497, lingual view of right maxilla, x 5. M. Deinodon horridus, AMNH 8513, posterior view of isolated tooth. N. Lateral view. Both x 13. 0. AMNH 8515, lateral view of anterior dentary tooth. P. Posterior view. Both x 13. Q. AMNH 8514, posterior view of?premaxillary tooth. R. Lateral view. Both x 12. S. Paronychodon lacustris, AMNH 8522, lingual view of isolated tooth. T. Labial view. Both x 12. U. Kritosaurus cf. K. breviceps, AMNH 8525, lateral view of isolated tooth. V. Posterior view. Both x 1 2. W. Procheneosaurus altidens, AMNH 8527, labial view of isolated tooth. X. Anterior or posterior view. Both x 12. Y, Z.?Sebecosuchia, AMNH 8549, views of an solated tooth. Both x 10.