Dear colleagues, The following article has just been published online in the *Journal of Acoustical Society of America*: Lima, I.M.S., Andrade, L.G., Carvalho, R.R., Lailson-Brito Jr., J., and Azevedo, A.F. (*2012*). "Characteristics of whistles from rough-toothed dolphins (*Steno bredanensis*) in Rio de Janeiro coast, southeastern Brazil,"Journal of Acoustical Society of America V. 131, Issue 5, pp. 4173-4181. Contact: isabelaseabra.lima@gmail.com Abstract: There is no information about the whistles of rough-toothed dolphins in the South Atlantic Ocean. This study characterizes the whistle structure of free-ranging rough-toothed dolphins recorded on the Rio de Janeiro coast, southeastern Brazil, and compares it to that of the same species in other regions. A total of 340 whistles were analyzed. Constant (N=115; 33.8%) and ascending (N=99; 29.1%) whistles were the most common contours. The whistles recorded had their fundamental frequencies between 2.24 and 13.94 kHz. Whistles without inflection points were frequently emitted (N=255; 75%). Some signals presented breaks or steps in their contour (N=97; 28.5%). Whistle duration was short (347*+*236 ms and 89.7% of the whistles lasted <600 ms). Seventy-eight whistle contour types were found in the total of whistles analyzed, and 27 (7.9%) of these occurred only once. Most of the whistle types were unique to a particular recording session (N=43). The signals emitted by the rough-toothed dolphins in southeastern Brazil were characterized by low frequency modulation, short duration, low number of inflection points, and breaks. Differences in the mean values of the whistle parameters were found between this and other studies that recorded *Steno* *bredanensis*, but as in other localities, whistles above 14 kHz are rare. The article is available online at: http://link.aip.org/link/?JAS/131/4173 Best regards, Isabela Lima -- Isabela Maria Seabra de Lima Bióloga - Mestranda Oceanografia/UERJ Laboratório de Mamíferos Aquáticos e Bioindicadores - MAQUA Faculdade de Oceanografia Universidade do Estado do Rio de Janeiro - UERJ Rua São Francisco Xavier, 524 4º andar sala 4002 bloco E Maracanã, Rio de Janeiro - RJ CEP 20.550-013 Tel: 21 23340065