. A diapsid reptile from the Pennsylvanian of Kansas. Reptiles, Fossil -- Kansas; Paleontology -- Pennsylvanian; Paleontology -- Kansas. 1980 PENNSYLVANIAN DIAPSID REPTILE 15. Fig. 10.—Petrolacosaurus kansensis Lane. Skull and lower jaws of young adult, KUVP 33608, X 2. The slightly disarticulated palate and braincase are in dorsal view by loss of skull table. Part of the cheeks and the left parietal are exposed in internal view. See Fig. 2 for key to abbreviations. the lacrimal and nasal. A heavily .sculptured ridge that runs from the anterior plate to the orbital margin separates th
. A diapsid reptile from the Pennsylvanian of Kansas. Reptiles, Fossil -- Kansas; Paleontology -- Pennsylvanian; Paleontology -- Kansas. 1980 PENNSYLVANIAN DIAPSID REPTILE 15. Fig. 10.—Petrolacosaurus kansensis Lane. Skull and lower jaws of young adult, KUVP 33608, X 2. The slightly disarticulated palate and braincase are in dorsal view by loss of skull table. Part of the cheeks and the left parietal are exposed in internal view. See Fig. 2 for key to abbreviations. the lacrimal and nasal. A heavily .sculptured ridge that runs from the anterior plate to the orbital margin separates the lateral and dorsal aspects of the skull in the antorbital region. A heavy posterior thickening of the prefrontal forms the anterodorsal angle of the orbit. The thickened dorsal orbital rim portion of the prefrontal extends far posteriorly and is sutured medially to the frontal in a well developed tongue and groove joint. The dor- sal orbital margin is rugose and probably ser\'ed as an attachment for part of the or- bital fascia. The prefrontal extends medially along its anterior orbital rim portion to form the verti- cal edge to which the orbitonasal membrane was probably attached. A well developed ventral process of the prefrontal orbital ridge is strongly sutured to the medial surface of the thickened orbital rim portion of the lacri- mal. The prefrontal is heavily sculptured near the orbital rim. Frontal.—The frontals are the third in the series of paired bones lying along the midline of the skull. Each is a long prominent bone that lies on the dorsal surface of the skull. In KUVP 33606 (Fig. 11) the two frontals are joined to each other along most of their length in a slightly wavy tongue and groove suture. Each is bounded anteriorly by the nasal and laterally by the prefrontal and post- frontal. Between the latter two elements the. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration a
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