English: Diagram of the bones of the skull of Spathicephalus mirus, shown in dorsal view.
Based on Figure 5A of "The cranial morphology and relationships of the aberrant Carboniferous amphibian Spathicephalus mirus Watson" by E. H. Beaumont and T. R. Smithson (Zoological Journal of the Linnean Society122(1-2): 187-209).
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