Amphibians of an area of castanhal of River Cajari's Reservation Extrativista, Amapá. This study had for objective to determine the wealth and abundance of species of amphibians of a castanhal, located in the northwest portion of River Cajari's Reservation Extrativista. During the study four samplings were accomplished and as methodologies the visual and auditory active search in three transectos of 1000 m of extension, the installation of pitfall traps and donations of animals for third. 410 amphibious specimens were registered represented by 09 families, 21 goods and 43 species (40 belonging to the Ordem Anura and 03 the Ordem Gymnophiona). The families Hylidae and Leptodactylidae contributed with larger wealth. The registered species are predominantly a little representatives of forest areas impactada, indicating that the area still maintains good environmental quality, possessing high wealth of species. Based on these results and obtained us for the group of the reptiles in the same area, this Unit of Conservation comes as fourth in number of species registered for the herpetofauna in areas of forest of firm earth (n=82) in the State of Amapá, being behind just of Rio Irataputu's RDS (n=120), of FLONA of Amapá (n=135) and of PARNA Montanhas of Tumucumaque (n=156). The number of species registered it can still be compared with other areas on the shield guianense as French Guiana and Suriname (103 and 102 species, respectively). With the results obtained in this study, hopes to contribute with the current knowledge of the herpetofauna of Amapá and of the amazon portion on the Shield of Guyana.

Larval and bioacoustical characters are crucial for anuran systematics. Nevertheless, advertisement calls and larval morphology of most Neotropical anuran species are unknown. Lysapsus is a peculiar group of aquatic frogs that have been subject to recurrent taxonomic changes. Recent molecular phylogenetic and external morphology work gave support for some of the recognized species (L. laevis and L. caraya), but considerable doubt remains over the distinction among L. limellum and L. bolivianus. We describe the tadpoles of L. caraya and L. bolivianus, the advertisement call of L. laevis, and redescribe the advertisement calls of L. caraya, L. limellum, and L. bolivianus. Our results support the genus based on larval and bioacoustical characters. Lysapsus caraya and L. laevis have distinct advertisement calls, but no visual or statistically significant differences were observed between advertisement calls of L. limellum and L. bolivianus. Tadpoles of L. caraya, L. limellum, and L. bolivianus are similar based on external morphology and contrast against the distinct tadpole of L. laevis. Considerable doubt is raised on the validity of L. bolivianus, which either is a junior synonym of L. limellum or constitutes a cryptic species based on currently available data. Data on osteology, musculature, and chondrocranium, allied to robust phylogeographic analyses will help clarify the taxonomic status of these two putative species and the biogeographic relationships between the Amazon and the Paraná River basins.