The intramandibular septum of the lower jaw is commonly interpreted as a derived character supporting monophyly of anguimorph lizards. However, it is also present in snakes, consistent with the view that snakes are related to or nested within anguimorph lizards.
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1 May 2001
On the Lower Jaw and Intramandibular Septum in Snakes and Anguimorph Lizards
Michael S. Y. Lee,
John D. Scanlon
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