. Breviora. BREVIORA No. 473 ventral cheek margin. They have the distribution shown in Figure 2C, with the derived character-state present in pelycosaurs being the presence of a concave cheek margin. The condition seen in Hylu- nomus is a separate, derived Figure 3. The skulls in right lateral view of A) Diadectes; B) Casea; C) Vara- nops; D) Ophiacodon; E) Edaphosaurus; and F) Sphenacodon. Drawing of Dia- dectes based on MCZ 1739. MCZ 1736, and MCZ 2086; Casea based on UC 698 and UC 656; Varanops based on MCZ 1926 and UR 2423; Ophiacodon based on UC 671; Edaphosaurus based o
. Breviora. BREVIORA No. 473 ventral cheek margin. They have the distribution shown in Figure 2C, with the derived character-state present in pelycosaurs being the presence of a concave cheek margin. The condition seen in Hylu- nomus is a separate, derived Figure 3. The skulls in right lateral view of A) Diadectes; B) Casea; C) Vara- nops; D) Ophiacodon; E) Edaphosaurus; and F) Sphenacodon. Drawing of Dia- dectes based on MCZ 1739. MCZ 1736, and MCZ 2086; Casea based on UC 698 and UC 656; Varanops based on MCZ 1926 and UR 2423; Ophiacodon based on UC 671; Edaphosaurus based on MCZ 1762, MCZ 1764, and USNM 299844; Sphenacodon from Eberth (1981). Abbreviations: U frontal; j, jugal; la, lacrymal; max, maxilla; na, nasal; pf, post- frontal; pmx. premaxilla; po, postorbital; prf, prefrontal; pt, pterygoid; q, quad- rate; qj, quadratojugal; sq, squamosal; st, 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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