Abstract Forest fragments in urban areas have many habitat resources that frogs use for refuge, reproduction and growth. Knowledge of an anuran assembly is the first step towards understanding the importance of these forest fragments in areas highly threatened by anthropogenic actions. We sampled anurans during the day and night from November 2012 to August 2013 through visual and acoustic surveys. We found 333 individuals belonging to 19 species. The highest richness and abundance were recorded in January whereas the lowest richness and abundance were recorded in June. Most species were found in open areas. Our results highlight the importance of well-studied urban fragments for the anuran community. The conservation of these habitats may ensure the viability of the ecological functions of this anuran community for the future.

ABSTRACT The integuments of ten treefrog species of two genera from Scinaxnae - O. angrensis (Lutz, 1973), O. flavoguttata (Lutz & Lutz, 1939), O. humilis (Lutz & Lutz, 1954), O. perpusilla (Lutz & Lutz, 1939), O. v-signata (Lutz, 1968), Scinax hayii (Barbour, 1909), S. similis (Cochran, 1952), O. trapicheroi (Lutz & Lutz, 1954) and S. x-signatus (Spix, 1824) - were investigated using conventional and histochemical techniques of light microscopy, and polarized light microscopy. All integuments showed the basic structure of the anuran integument. Moreover, the secretory portions of exocrine glands, such as serous merocrine and apocrine glands, were found to be restricted to the spongious dermis. Lipid content occurred together with the heterogeneous secretory material of the glands with an apocrine secretion mechanism. In addition, clusters of these apocrine glands were present in the ventrolateral integument of some species. Melanophores were also visualized in all examined hylids. However, the occurrence of iridophores, detected through polarized light microscopy, varied according to the species. The Eberth-Katschenko layer occurred in the dorsal integument from both genera, but it was only present in the ventral integument of O. albicans, O. angrensis, O. flavoguttata, O. perpusilla and O. v-signata. Although the integument of all treefrogs showed the same basic structure, some characteristics were genus-specific; however, these features alone may not be used to distinguish both genera.

Os anfíbios anuros da RPPN Campo Escoteiro Geraldo Hugo Nunes, localizado no Município de Guapimirim, Estado do Rio de Janeiro, foram inventariados e estudados. A região é um remanescente de Mata Atlântica de Baixada que ocupa 45,2 ha e está situada sobre um solo hidromórfico que favorece a ocorrência de áreas alagadas permanentes e temporárias. Para o inventário, realizamos excursões para coleta e registro de anfíbios desde a década de 80, estando este material tombado na coleção zoológica do Instituto de Biologia da Universidade Federal do Rio de Janeiro. Um total de 40 espécies de anfíbios da ordem Anura foi encontrado na região, distribuídas em 10 famílias: Hylidae (N = 23), Bufonidae (4), Leptodactylidae (4), Cycloramphidae (2), Microhylidae (2), Brachycephalidae, Craugastoridae, Hemiphractidae, Leiuperidae e Strabomantidae com uma espécie cada.

We studied the anuran amphibians from RPPN Campo Escoteiro Geraldo Hugo Nunes. The region is located in the Municipality of Guapimirim, State of Rio de Janeiro, in Southeastern Brazil and represents a lowland Atlantic Rainforest remaining, which has 45.2 ha. The hydromorphic soil is conducive to the occurrence of permanent and temporary wetlands. For the study, we carried out field expeditions since the 1980's, being the collected specimens housed at the zoological collection of the Instituto de Biologia, Universidade Federal do Rio de Janeiro. A total of 40 amphibian species of the order Anura have been found at the study site. The species are distributed in 10 families: Hylidae (N = 23), Bufonidae (4), Leptodactylidae (4), Cycloramphidae (2), Microhylidae (2), and Brachycephalidae, Craugastoridae, Hemiphractidae, Leiuperidae and Strabomantidae with one species each. Data on local reproductive environments of the recorded species are provided.