On behalf of all the co-authors, we are pleased to announce the publication of the following paper: High-frequency whistles of Guiana dolphins (Sotalia guianensis) in Guanabara Bay, southeastern Brazil.  Abstract: Guiana dolphins produce whistles with a higher frequency and less complexity than most other delphinid species. The presentstudy used a recording system with sampling rate of 192 kHz to describe the high-frequency whistles of Sotalia guianensis in Guanabara Bay,Rio de Janeiro. Eleven acoustic parameters (start, end, minimum, maximum, delta, center and peak frequency, duration, and frequency at 1/4, 1/2, and 3/4 duration) were measured for all whistles. Whistles with a fundamental frequency up to 66.7 kHz were reported, thereby expanding the known frequency range of this species.  JASA Express Letters, DOI: 10.1121/1.4902428 Please download the article from the following link: URL: http://scitation.aip.org/content/asa/journal/jasa/137/1?aemail=author Or by e-mail: andrade.uerj@gmail.com Best regards, Luciana Guimarães de Andrade Doutoranda - Programa de Pós-Graduação em Ecologia e Evolução - UERJ Laboratório de Mamíferos Aquáticos e Bioindicadores - MAQUA -Faculdade de Oceanografia Universidade do Estado do Rio de Janeiro - UERJ, Rio de Janeiro, Brazil Tel: 21 23340065