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FIGURE 5. Osteological features of Proceratophrys species. Squamosal bone of Proceratophrys appendiculata, with tubercles and crests (A) and Proceratophrys izecksohni sp.nov. with smooth surface (morphology also representative of Proceratophrys belzebul sp.nov. (B); frontoparietal bones morphology for Proceratophrys appendiculata (C), Proceratophrys izecksohni sp.nov. (D), and Proceratophrys belzebul sp.nov. (E); ilium of Proceratophrys appendiculata (F) and Proceratophrys belzebul sp.nov. with a small projection, representing less than 30% of ilium diameter (G). Scale bar = 10.0 mm.