| Sumario: | Freshwater turtles represent a diverse group of reptiliaforms in Mexico, with the highest diversity being distributed mostly in the southern tropical states. Unfortunately, knowledge regarding their ecology, behavior, cultural importance, and reliable geographic distribution is still scarce; consequently, preventing in-depth spatial analyses that aim to provide a set of conservation plans that effectively shield them from high risks of extinction. Herein, we provide additional geographic records for four endangered species of freshwater turtles in the state of Oaxaca. These records not only expand their distribution range, but also provide information on habitat, and possible environmental threats. Importantly, the record of Chelydra rossignonii confirms its presence in the Papaloapan river basin; and the records of Dermatemys mawii and Claudius angustatus are among the first for the state. Furthermore, we provide an additional locality for Staurotypus triporcatus.
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