Herpetofaunal studies in Brazil lack information about their taxonomy and biology, especially with regard to amphibians, a group in which new species are periodically described. Currently, 335 species of amphibians (two of salamanders, 28 of gymnophionae and 305 of anurans) and 347 species of reptiles (four of crocodilians, 18 of chelonians, 130 of lizards, 15 of amphisbaenians and 180 of snakes) are recorded for the Amazon. The main objective of this study was to inventory the amphibian and reptile fauna of the Bacaba Plateau, located in the Saracá-Taquera National Forest, municipality of Oriximiná, state of Pará, generating qualitative and quantitative data to characterize the local herpetofauna. To this end, two expeditions were made to the study site, during the months of June and October 2007. The data obtained in the field were compared with those already recorded in the Herpetology Collection of the Museu Paraense Emílio Goeldi (MPEG), from expeditions carried out in previous years. Four complementary methodologies were used to capture the specimens: Visual Search limited by Time on Foot and by Car, Interception and Fall Traps and Occasional Encounters. No total, foram coletados 256 espécimes de anfíbios e répteis, distribuídos em 18 famílias (sete de anúbios, seis de lagartos, uma de anfisbenas e quatro de serpentes) e 59 espécies (20 de anfíbios, 19 de lagartos, duas de anfisbenas e 18 de répteis). Entre os anfíbios, a ordem Gymnophiona foi representada Rhínatrema bívíttatum (n=1) e Mícrocaecílía sp. (n= 1), enquanto que Adenomera sp. (n=91) e Rhínella margarítífera (n= 18) foram as espécies mais abundantes da ordem Anura. Para os répteis da ordem Squamata, as espécies mais representativas dos lagartos foram Leposoma guíanense (n=8) e Ameíva ameíva (n=8) e, para serpentes, Leptotyphlops tenellus(n=6) e Líophís typhlus(n=5). O presente estudo registrou um incremento de 10,32% de novos registros para a área estudada, porém esses dados certamente estão subestimados, podendo haver um acréscimo do número de novos registros caso haja novas expedições.
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