Pseudoeurycea maxima Parra-Olea, García-París, Papenfuss, and Wake, 2005, Herpetologica, 61: 154. Holotype: MVZ 106581, by original designation. Type locality: "6 km south of Putla de Guerrero, Oaxaca, Mexico, approximately 16° 58.7′ N, 97° 53.8′ W; elevation approximately 750 m)".
Southern Giant Salamander (original publication).
Far western and southern Oaxaca, as far south as 15 km north of San Gabriel Mixtepec, in elevation as low as 730 m but generally above 2000 m elevation, west to Ejido Tres Marias, muncipality of Malinaltepec.
In the Pseudoeurycea bellii complex according to the original publication. Raffaëlli, 2007, Les Urodèles du Monde: 222, provided a brief account and map, and considered it to be in the Pseudoeurycea bellii complex of the Pseudoeurycea bellii group. Delia, Whitney, and Parra-Olea, 2008, Check List, 4: 65-68, provided the southern-most record in Oaxaca, Mexico. García-Vázquez and Durán-Fuentes, 2012, Herpetol. Rev., 43: 438, provided a record for Guerrero, Mexico, in the municipality of Malinaltepec.
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