Image: Stygimoloch skull

Description: The distinctive squamosal ornamentation and relatively high, narrow frontoparietal dome of Stygimoloch spinifer. The holotype left squamosal (UCMP 119433) in (A) and a right squamosal (UCMP 131163) in (B) in posterior view. UCMP 131163 was found associated with the relatively high, narrow frontoparietal dome in right lateral view in (C). The frontoparietal suture is highlighted in white. The intrafrontal suture is not visible on the dorsal surface. Numbering sequence (1–3) of horns and nodes in (A) and (B) from Galton and Sues [31]. Scale bars are 5 cm.
Title: Stygimoloch skull
Credit: Horner JR, Goodwin MB (2009) Extreme Cranial Ontogeny in the Upper Cretaceous Dinosaur Pachycephalosaurus. PLoS ONE 4(10): e7626. doi:10.1371/journal.pone.0007626.g001
Author: John R. Horner, Mark B. Goodwin
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