. Breviora. 1983 PELYCOSAUR INTERRELATIONSHIPS 15 Basipterygoid Prtesses The basipterygoid processes of Dimetrodon (Fig. 7G), Sphena- codon, and Edaphosaurus (Fig. 7F) extend anteriorly, ventrally, and laterally from the lateral surface of the basisphenoid. Each articular surface is divided into two areas, a flat anteroventrally facing area and a dorsally facing area at nearly 90 degrees to Figure 6. Occipital view of the skulls of A) Casea; B) Ophiacodon; C) Edapho- saurus; and D) Sphenacodon. Drawing of Casea based on UC 698 and UC 656; Ophiacodon based on MCZ 1366. MCZ 1426, and MCZ
. Breviora. 1983 PELYCOSAUR INTERRELATIONSHIPS 15 Basipterygoid Prtesses The basipterygoid processes of Dimetrodon (Fig. 7G), Sphena- codon, and Edaphosaurus (Fig. 7F) extend anteriorly, ventrally, and laterally from the lateral surface of the basisphenoid. Each articular surface is divided into two areas, a flat anteroventrally facing area and a dorsally facing area at nearly 90 degrees to Figure 6. Occipital view of the skulls of A) Casea; B) Ophiacodon; C) Edapho- saurus; and D) Sphenacodon. Drawing of Casea based on UC 698 and UC 656; Ophiacodon based on MCZ 1366. MCZ 1426, and MCZ 1121; Edaphosaurus based on MCZ 1762; and Sphenacodon from Eberth (1981). Abbreviations: bo, basioccipital; eo, exoccipital; op, opisthotic; par, parietal; pp. postparietal; q, quadrate; qj, quadratojugal; sq, squamosal; tab, Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Harvard University. Museum of Comparative Zoology. Cambridge, Mass. , Museum of Comparative Zoology, Harvard University
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