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1 Centro Avançado de Pesquisa Tecnológica do Agronegócio do Pescado Marinho, Instituto de Pesca, Santos, Brasil. E-mail: margalvao@pesca. sp.gov.br (corresponding author) 2 Universidade de Mogi das Cruzes, Núcleo Integrado de Biotecnologia, P.O. Box 411, 08701-970, Mogi das Cruzes, SP, Brasil. PRIMEIRO REGISTRO DA OSTRA Saccostrea EM BERTIOGA, SÃO PAULO, BRASIL ABSTRACT This study presents the first record of an alien species of oyster in Bertioga, São Paulo State (Southeast Brazilian coast). Alien oysters were found attached to mangrove roots, rock shores, stones and gravel in the riverbed, forming clusters of 10–20 individuals and cohabiting with native oyster species (Crassostrea mangle, C. brasiliana and Ostrea sp.). Results are presented based on molecular analysis of specimens collected in the Itaguaré River in June 2014. We used partial sequences of 16S and COI genes to assess the taxonomic identity. The Neighbor-joining method was used to analyze phenetic relationships among samples and the genetic diversity was calculated from the Kimura two-parameter (K2P) distances. The sequences in this work clustered with a sequence of “Saccostrea cucullata” from Madagascar for both genes (COI and 16S) and presented a genetic distance of 1.7 – 2.2% and 3.5 – 5.3% from other sequences of “S. cucullata group” for 16S and COI fragments, respectively. The genetic distances from others Saccostrea species (S. palmula, S. glomerata and S. mordax) ranged from 4.7 to 9.1% for 16S and from 13.8 to 19.0% for COI. The genetic distances from other oysters’ species sequences (genera Ostrea and Crassostrea) are over than 14.0% and 25.0% for 16S and COI, respectively. The record is discussed in the context of possible consequences on the environment and probable pathways of introduction. This is the first published record of a Saccostrea species in the southwestern Atlantic Ocean.

Primeiro registro da ostra Saccostrea em Bertioga, São Paulo, Brasil