Population genetics of the Amazonian tortoises, Chelonoidis denticulata and C. carbonaria, (Cryptodira: Testudinidae) in an area of sympatry - Farias, Izeni Pires; Jerozolimski, Adriano; Melo, Afrânio; Viana, Maria das Neves; Martins, Marcio; Monjeló, Luis Alberto dos Santos (Amphibia-Reptilia, 2007)