Taxonomic revision of the recent marine Corbulidae (Mollusca, Bivalvia) from Brazil.

The present study provides a taxonomic revision of living species of Corbulidae from Brazil based on shell characters, including the examination of the type material and specimens from different collections from Brazil, USA and Europe. There are twelve species of Corbulidae in Brazil belonging to Corbula, Caryocorbula, Juliacorbula, Tenuicorbula and Varicorbula. Caryocorbula chittyana, Caryocorbula marmorata, Caryocorbula luteola and Juliacorbula bicarinata are new occurrences in Brazil. Corbula dietziana, Caryocorbula swiftiana and Caryocorbula chittyana have identical shell morphologies to species from the Eastern Pacific possibly indicating closer phylogenetic relationships. Corbula tryoni and Corbula patagonica appear to be endemic to South America. These latter species are similar to Corbulidae from the Indo-Pacific. Based on comparisons with type material, the following synonymies are suggested: Corbula uruguayensis, traditionally considered a synonym of Caryocorbula swiftiana, is a specimen in pre-accretion stage of C. patagonica, and Corbula caribaea, Corbula barratiana and Corbula kjoeriana are synonyms of Caryocorbula swiftiana. Three species have great morphological variability, C. patagonica, C. swiftiana and Juliacorbula aequivalvis; most species exhibit great post-larval ontogenetic variability.

Veneridae (Mollusca, Bivalvia) da costa norte do Estado de São Paulo, Brasil / Veneridae (Mollusca, Bivalvia) from the north coast of São Paulo State, Brazil

Coletas intensivas da fauna bentônica marinha da costa norte do Estado de São Paulo, realizadas pelos programas de pesquisa "Fauna de Praia/UNICAMP" de agosto de 1995 a julho de 1997 e "Biota/FAPESP" de março de 2001 a dezembro de 2002 recolheram 2769 exemplares pertencentes a dezesseis espécies, doze gêneros e sete subfamílias. A caracterização de cada espécie foi ampliada com redescrição e ilustrações detalhadas, baseadas nos caracteres da concha. Tabelas comparativas dessas características e uma chave dicotômica de identificação das subfamílias são apresentadas neste estudo.

This study concerns the Veneridae bivalves sampled during the research programs "Fauna de Praia/UNICAMP" and "Biota/FAPESP" carried out between August 1995 and July 1997 and between March 2001 and December 2002 respectivelly, in the north coast of São Paulo State, Brazil. A total of 2769 individuals belonging to sixteen species, twelve genera and seven subfamilies were recorded and the characterization of each species improved with detailed redescription and illustrations based on the shell characters. Comparative tables and a identification dichotomic key for subfamilies focused in this study are provided.