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Investigations of the distribution of marine organisms provide a better understanding of the patterns of distribution and dispersal of these animals. Extensions of the distributional limits of decapod crustaceans in Brazilian waters have been recorded steadily and gradually, but these limits still remain poorly understood. The present study provides information extending the known range of eight species of brachyuran crabs and one species of porcellanid crab. The animals were obtained by Scuba diving during a sampling program carried out near Vitória Island, Ilhabela, on the northeastern coast of the State of São Paulo (23º44'04"S-45º01'35"W) between February, 2004 and January, 2005. These new records extend the geographical distributions of the porcellanid Petrolisthes amoenus (Guérin Menéville, 1855), the majoids Mithrax caribbaeus Rathbun, 1920, Mithrax verrucosus H. Milne Edwards, 1832, Nemausa acuticornis (Stimpson, 1871) and Teleophrys ornatus Rathbun, 1901, and the xanthoids Domecia acanthophora acanthophora (Desbonne & Schramm, 1867), Garthiope spinipes (A. Milne Edwards, 1880), Xanthodius denticulatus (White, 1847) and Xanthodius parvulus (Fabricius, 1793) to the São Paulo coast. These new records may be related to different mechanisms of larval dispersal, larval transport by ballast water, or may simply be exceptional records. Investigações sobre a distribuição de organismos marinhos proporcionam um melhor entendimento dos padrões de distribuição e dispersão desses animais. As ampliações dos limites de distribuição de crustáceos decápodos em águas brasileiras têm sido registradas de maneira constante e gradual, mas ainda permanecem pouco compreendidas. Este estudo fornece informações sobre a ampliação da distribuição de oito espécies de caranguejos braquiúros e uma espécie de caranguejo porcelanídeo. Os animais foram obtidos por meio de mergulho Scuba durante um programa amostral, realizado na região da Ilha da Vitória, Ilhabela, litoral norte paulista (23º44'04"S-45º01'35"W), entre fevereiro de 2004 e janeiro de 2005. Estes novos registros ampliam a distribuição geográfica do porcelanídeo Petrolisthes amoenus (Guérin Menéville, 1855), dos majóideos Mithrax caribbaeus Rathbun, 1920, Mithrax verrucosus H. Milne Edwards, 1832, Nemausa acuticornis (Stimpson, 1871) e Teleophrys ornatus Rathbun, 1901, além dos xantóideos Domecia acanthophora acanthophora (Desbonne & Schramm, 1867), Garthiope spinipes (A. Milne Edwards, 1880), Xanthodius denticulatus (White, 1847) e Xanthodius parvulus (Fabricius, 1793) para o litoral paulista. O recente registro dessas espécies pode estar relacionado com diferentes mecanismos de dispersão larval, transporte larval por meio de água de lastro ou ainda o registro tardio

Extension of the geographical distribution of some brachyuran and porcellanid decapods (Crustacea) to the coast of the State of São Paulo, Brazil