Parasaniwa wyomingensis Gilmore, 1928

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 : 355-357

Parasaniwa wyomingensis Gilmore, 1928

Figure 8J

A left dentary fragment of Parasaniwa containing three tooth bases, AMNH 8499 (fig. 8J), has been recovered from Clambank Hollow. The dentary consists of a large, ventrally convex tooth-bearing border which descends anteriorly to the ventral edge of the lower jaw. The tooth bases are prominently folded externally as well as internally. The number of folds exceeds that found in Paraderma and may be as high as 10 on the lingual side. The tooth base is not expanded and usually a small foramen is present on its posterior side.

The anterior portion of a maxilla, AMNH 8503, has been recovered from Clambank Hollow. Its teeth are identical to those found on the dentary and the anterior two or three are much smaller than the posterior teeth. Externally, the maxilla is smooth and the sculpturing is not so marked as in Exostinus or Paraderma .

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.