Submitted by Alberto Vieira (martins_vieira@ibest.com.br) on 2017-09-18T23:40:31Z No. of bitstreams: 1 200527.pdf: 12876596 bytes, checksum: dc6c904a46d07b6363cc9a5b23cd8313 (MD5) / Made available in DSpace on 2017-09-18T23:40:31Z (GMT). No. of bitstreams: 1 200527.pdf: 12876596 bytes, checksum: dc6c904a46d07b6363cc9a5b23cd8313 (MD5) Previous issue date: 1982-05-07 / Apresenta um estudo sobre os moluscos bivalves marinhosdo gênero Mactra Linnaeus, 1767, pertencentes à família Mactridae, assinalados para o Rio de Janeiro. São apresentadas caracterizações de subclasses a subgênero e, para as espécies Mactra (Mactra) isabelleana Orbigny, Mactra (Mactra) patagonia Orbigny, Mactra (Mactra) marplatensis Doello - Jurado, Mactra (Micromactra) Janeiroensis Smith, Mactra (Mactrotoma) petiti Orbigny e Mactra (Mactrotoma) fragilis: Gmelin, além das caracterizações, são tecidas considerações taxonômicas, morfológicas, ecológicas e de distribuições geológica e geográfica. / The main objective of this essay is the study of marine bivalves mollusks of the genus Mactra Linnaeus, 1767, which belongs to the Mactridae family, found in the coastal area of the state of Rio de Janeiro. The characteristics from subclass to subgenus are presented in this study. Besides, there are discussions related to taxonomics, morphologics and ecologics characteristics Connected with geological and geographical distribuitions for the following species: Mactra (Mactra) isabelleana Orbigny, Mactra (Mactra) patagonia Orbigny, Mactra (Mactra) marplatensis Doello - Jurado, Mactra (Micromactra) Janeiroensis Smith, Mactra (Mactrotoma) petiti Orbigny e Mactra (Mactrotoma) fragilis: Gmelin.