Phrynops williamsi, also known commonly as Williams' side-necked turtle, Williams' South American sideneck turtle, William's [sic] South American side-necked turtle, William's [sic] toadhead turtle, and Williams' toadhead turtle, is a species of turtle in the family Chelidae. The species is endemic to South America.
^Rhodin, A.G.J.; Bressan, R.F.; Buskirk, J.R.; Cabrera, M.R.; Carreira, S.; Estrades, A.; Mittermeier, R.A.; Vinke, S.; Vinke, T. (2018). "Phrynops williamsi". IUCN Red List of Threatened Species. 2018: e.T172024A1339018. doi:10.2305/IUCN.UK.2018-2.RLTS.T172024A1339018.en. Retrieved 18 November 2021.
^Rhodin, Anders G.J., and Mittermeier, Russell A. (1983). "Description of Phrynops williamsi, a new species of chelid turtle of the South American P. geoffroanus complex". pp. 58-73. In: Rhodin, A.G.J., and Miyata, K. (Editors) (1983). Advances in Herpetology and Evolutionary Biology. Essays in Honor of Ernest E. Williams. Cambridge, Massachusetts: Museum of Comparative Zoology.
^Fritz, Uwe; Peter Havaš (2007). "Checklist of Chelonians of the World". Vertebrate Zoology. 57 (2): 341–342. doi:10.3897/vz.57.e30895. ISSN 1864-5755.
^van Dijk, Peter Paul, John B. Iverson, H. Bradley Shaffer, Roger Bour, and Anders G.J. Rhodin (2012). "Turtles of the World, 2012 Update: Annotated Checklist of Taxonomy, Synonymy, Distribution, and Conservation Status". Chelonian Research Monographs No. 5, pp. 000.243–000.328.
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is endemic to South America. In the past, Phrynops tuberosus has been considered a subspecies of Phrynops geoffroanus, but since 2021 it is afforded...
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