Researchers at the National Autonomous University of Mexico have identified a new fossil salamander species named Ambystoma quetzalcoatli, discovered in Hidalgo, approximately 100 km north of Mexico City. This species is closely related to the well-known axolotl (Ambystoma mexicanum), notable for its juvenile features and regenerative abilities. The fossils, recovered from Pliocene sediments of an ancient lake, are the first complete specimens of ambystomatid salamanders found in Mexico, providing critical insights into their evolution. The unique skull morphology of A. quetzalcoatli distinguishes it from other species, indicating a significant evolutionary divergence. This discovery is particularly important as it contributes to understanding the biodiversity and evolutionary history of salamanders in the region, which is known for its rich biodiversity. The researchers also noted the presence of two frog species that coexisted with A. quetzalcoatli, with further studies on these species forthcoming. The study has been published in the journal Palaeontologia Electronica.