Lists o f species Check List 10(1): 97–105, 2014 © 2014 Check List and Authors ISSN 1809-127X (available at www.checklist.org.br) elements in trophic chains and are commercially relevant. Estimates suggest that there are about 1,000 marine bivalve species in Brazil; approximately 300 of these are believed to occur in São Paulo State, but only 191 were published (Simone 1999). Despite the importance of bivalves in the marine environment, there are few details on their distribution, especially on those species living subtidally at greater depths. Malacofaunal studies in the São Sebastião Channel include the pioneer survey of Ihering (1897), as well as the study of Migotto et al. (1993), which analyzed several locations along the channel, and the investigation of Salvador et al. (1998), which focused on the central-northern beaches of Ilhabela. Considering the absence of current data on bivalve diversity and distribution within the intertidal and subtidal zones of the north coast of the São Paulo State, this work aims to present an updated list of bivalve species within the São Sebastião Channel. Materials And Methods São Sebastião Channel is located between the municipalities of São Sebastião and Ilhabela on the north coast of São Paulo State, southeast Brazil; it is 25 km long, 2–7 km wide and up to 40 m deep in the central area (Netto et al. 2005; Oliveira et al. 2010). The climate is subtropical and water temperatures oscillate from 15 to 20°C (Migotto et al. 2001). The bivalves were obtained from sediment samples collected in the intertidal and subtidal zones between January 2010 and December 2012. Only living specimens with soft parts were considered in this survey. Introduction The municipalities of São Sebastião and Ilhabela are within an area of important biodiversity along northern coast of São Paulo State. Between the continent and Ilhabela island is the São Sebastião Channel (Figure 1). In this area, marine communities have been irreversibly altered because of exponential urban growth and anthropogenic influence in coastal zones. The commercial harbor at São Sebastião, an oil terminal (Dutos e Terminais Centro Sul -DTCS) (Zanardi et al. 1999), and two submarine outfalls (one on the mainland, near the harbor at the Araçá Bay, and another at Saco da Capela, in Ilhabela municipality) have increasingly contributed to local contamination by chemical compounds. Furthermore, much attention has been given to this area due to an expansion of the harbor at São Sebastião, which requires information about environmental impact to marine ecosystems at the region (Teodoro et al. 2010). In this context, all knowledge on ecological dynamics of coastal and oceanic areas represents important contributions to the evaluation and monitoring of environmental quality. New information is essential to planning and can draw attention to the preservation and sustainability of this delicate natural heritage in São Paulo State (Arasaki et al. 2004; Amaral et al. 2010; Teodoro et al. 2010). São Sebastião Channel has been an important hub for scientific research due to its variety of habitats and biodiversity. Mollusks are conspicuous among the invertebrate groups found in this region (Amaral et al. 2010). Bivalves contribute to the conduction of nutrients from the pelagic to the benthonic zone, are considered key