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John D. Scanlon; Michael S. Y. Lee (January 2000). "The Pleistocene serpent Wonambi and the early evolution of snakes. FIGURE 2. Selected elements of Wonambi exhibiting phylogenetically important characters". Nature. 403 (6768): 416–420. doi:10.1038/35000188. PMID10667791. S2CID4404799.
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