Despite the great diversity of amphibian species observed in Serra dos Carajás, no study gathering information on the amphibian species of this region has been published. This study aimed to catalog specimens of amphibians from the Carajás region, to obtain morphological measurements and identification of these specimens, and to gather information on the habitats and geographic distribution of the identified species. Initially, the observations involved only the material collected in the area of influence of the Salobo Project, and during the course of the study, the specimens collected in the Serra Norte area in the 1980s (MPEG Herpetological Collection) and the species recorded in the Collection of the State University of Campinas (UNICAMP) were also included. For specimens from the Salobo Project area of influence and the MPEG Herpetological Collection, we determined the reproductive classes (male, female or juvenile), obtained measurements of total length (rostrum-cloaca), and observed the characteristics of taxonomic importance, such as the presence of tubercles, folds, and coloration patterns. Information on the capture sites and habitats and geographic distribution of the species was also gathered. As a result of combining the material from the MPEG collection, the Salobo Project and the UNICAMP collection, 524 specimens were observed, yielding a total of 58 species, of which 23 species (39, 56%) belong to the Hylidae family, 19 (32.75%) to the Leptodactylidae family, 7 (12.06%) to the Bufonidae family, 7 (12.06%) to the Dendrobatidae family, 3 (5.17%) to the Microhylidae family and 1 (1.57%) to the Pipidae family. Of these 58 species, 6 (10.3%) from the Salobo Project, 5 (8.6%) from the MPEG collection, and 4 (6.8%) from the UNICAMP collection, have an undefined taxonomic status. As studies continue, efforts will be concentrated on these species in order to better characterize them for unequivocal identification.
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