. A diapsid reptile from the Pennsylvanian of Kansas. Reptiles, Fossil -- Kansas; Paleontology -- Pennsylvanian; Paleontology -- Kansas. 16 SPECIAL PUBLICATION MUSEUM OF NATURAL HISTORY NO. 7. Fic. 11.—Pctrolacosaurus kanscnsis Lane. Mature .';!ai!l and left lower jaw, KU\'P 33606, X 2. Part of the dermal skull roof is exposed in donsal view, in almost perfect association; partial left lower jaw is seen in lateral view. See Fig. 2 for key to abbreviations. frontal forms the orbital margin, and is slight- ly rugose to provide better attachment for the orbital fascia. Posteriorly, the frontal in
. A diapsid reptile from the Pennsylvanian of Kansas. Reptiles, Fossil -- Kansas; Paleontology -- Pennsylvanian; Paleontology -- Kansas. 16 SPECIAL PUBLICATION MUSEUM OF NATURAL HISTORY NO. 7. Fic. 11.—Pctrolacosaurus kanscnsis Lane. Mature .';!ai!l and left lower jaw, KU\'P 33606, X 2. Part of the dermal skull roof is exposed in donsal view, in almost perfect association; partial left lower jaw is seen in lateral view. See Fig. 2 for key to abbreviations. frontal forms the orbital margin, and is slight- ly rugose to provide better attachment for the orbital fascia. Posteriorly, the frontal inter- digitatcs with the anterior margin of the parietal. The frontal forms a wedge, postero- laterally, which partially separates the post- frontal and jiarietal. The suture between the postfrontal and the frontal is also of the tongue and groove type, similar to the suture between the prefrontal and frontal. In lateral view, the frontal is convex in outline, follow- ing the curve of the dorsal margin of the orbit. In cross-section, the frontal is slightly convex over the orbit. As seen in KUVP 9952 (Fig. 8b), the frontal has a strongly devel- oped ridge on its ventral surface that runs the length of the bone, roughly parallel to the midline. It is to this ridge that both the pre- frontal and the postfrontal are attached in order to brace the anterodorsal and postero- dorsal corners of the orbit. This ridge is most pronounced over the orbit. Parietal.—The parietal in Pctrolacosaurus is readily distinguishable from that of capto- rhiuomorphs and pelycosaurs because it forms part of the border of a well developed su- perior temporal fenestra. It resembles the parietal of other "eosuchians" and of arae- oscelids. The description given here is based on well preserved parietals in KUVP 9951, 9952, 9959a, 33606, and 33607, and on isolated single elements in KUVP 9950, 33603, and 33604. Along the anterior part of its lateral border the parietal fonns an "L" sha
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Keywords: ., bookcentury1900, bookcollectionbi, booksubjectpaleontologykansas
