Ankylosphenodon is thought to have been an aquatic reptile due to its pachyostotic skeleton and other anatomical features often seen in aquatic animals. There is also evidence that its teeth were constantly growing throughout its lifetime, which may be indicative of herbivory, a rare characteristic among Lepidosauria.
- Reynoso, Victor-Hugo (2000). "An unusual aquatic Sphenodontian (Reptilia: Diapsida) from the Tlayua Formation (Albian), Central Mexico". Journal of Paleontology. 74 (1): 133–148. doi:10.1017/S0022336000031310. JSTOR 1306891.
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