. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. Figure 8. Pancelosaurus piger, n. gen. A, left palatine, ventral view, MCZ 3495; B, the same, dorsal view; C, right frontal, dorsal view, UC 61414; A-B, Upper Paleocene Bison Basin deposits, Wyoming; C, Upper Cretaceous Lance Formation, Wyoming. All X 8. In lateral view frontal displays two deep incisions. Large anterior prefrontal incision occupies over half and smaller prefrontal incision one-third total length of orbital border of frontal bone. The above incisions separated by about one-seventh total length of this
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. Figure 8. Pancelosaurus piger, n. gen. A, left palatine, ventral view, MCZ 3495; B, the same, dorsal view; C, right frontal, dorsal view, UC 61414; A-B, Upper Paleocene Bison Basin deposits, Wyoming; C, Upper Cretaceous Lance Formation, Wyoming. All X 8. In lateral view frontal displays two deep incisions. Large anterior prefrontal incision occupies over half and smaller prefrontal incision one-third total length of orbital border of frontal bone. The above incisions separated by about one-seventh total length of this bone. Olfactory processes on ventral surface well developed, but separated ventrally. Comparison. The frontals of Pancelo- saurus piger resemble closely those of Re- cent Diploglossus; they agree in general outline, in epidermal scalation as indicated by impressions on the osteoscutal surface, in being suturally distinct, and in having nearly identical sculpture on the osteo- scutes covering these bones. In Pancelosaurus piger, as well as in Diploglossus, the frontoparietal scale im- pressions are large, and left and right scales are well separated from one another at the midline by the interparietal scale impres- sion. Similar scalation is also found in the fossil Xestops vagans and the Recent ophi- saurs, Anguis, and diploglossines. The sculpture of the osteoscutal surface in P. piger is of irregular pits and ridges, in strong contrast to the raised tubercular mounds on the frontals of X. vagans. In Ophisaurus, the frontoparietal epi- dermal impressions are much smaller and more widely separated than in Pancelo- saurus piger; there is less correspondence in general outline, as well. The entire lateral edges of the Ophisaurus frontals are devoid of osteoscutes as a result of the presence of small, loosely-attached osteo- scutes covering this area. Pancelosaurus frontals share only a similar type of dermal sculpture with the fused, emarginate frontals of Recent Ger- rhonotus,
Size: 1006px × 2484px
Photo credit: © Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorharvarduniversity, bookcentury1900, booksubjectzoology
