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Pavón-Vázquez, C.J.; García-Vázquez, U.O.; Blancas-Hernández, J.C.; Nieto-Montes de Oca, A. 2011 A new species of the Geophis sieboldi group (Squamata: Colubridae) exhibiting color pattern polymorphism from Guerrero, Mexico. Herpetologica 67(3): 332-343.