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Morphological phylogenetic analysis of the mactrid subfamilies Mactrinae and Kymatoxinae, plus the mactroidean family, Anatinellidae, indicate that the Kymatoxinae shares closer common ancestry with the Anatinellidae than with the Mactridae. Kymatoxinae is, therefore, reassigned from Mactridae to subfamily rank within Anatinellidae. The lack of a pallial sinus in Anatinella G. B. Sowerby I, 1833 suggests that its family was derived from anatomically plesiomophic members of Mactroidea with at best only weakly developed siphons. Fil: Signorelli, Javier Hernan. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Nacional Patagónico; Argentina Fil: Carter, Joseph G.. University of North Carolina; Estados Unidos

Living bivalves of the family Mactridae from Northern Argentina and Uruguay are herein revised. A bibliographical research yielded 22 nominal species reported from this area. Material from several institutions as well as fi eldwork from La Paloma, Uruguay to San Blas, Argentina was studied. In addition, all type material were illustrated and redescribed. Descriptions of the soft and hard parts including ultrastructure of the shell, hinge and ligament using the Scanning electronic microscope (SEM) were carried out. We consider Mactra guidoi Signorelli and Scarabino, 2010, Mactra isabelleana d ́Orbigny, 1846, Mactra marplatensis Doello-Jurado, 1949, Mactra petitii d ́Orbigny, 1846 , Mactrella janeiroensis (Smith, 1915), Raeta plicatella (Lamarck, 1818) and Darina solenoides (King, 1832) as valid species. In addition, a list of synonyms as well as the corroborated distribution is proposed for each species. Fil: Signorelli, Javier Hernan. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Centro Nacional Patagónico. Instituto de Biología de Organismos Marinos; Argentina Fil: Pastorino, Roberto Santiago Guido. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Museo Argentino de Ciencias Naturales "Bernardino Rivadavia"; Argentina

abercrombiei, Raeta Melvill 1893: 64; pl. 1, fig. 25. Nomen nudumin Melvill and Abercrombie 1893: 48. Bombay. Seven syntypes (one complete and 6 single valves) EE.3661 {Abercrombie}., Published as part of McGhie, Henry, 2008, Catalogue of type specimens of molluscs in the collection of The Manchester Museum, The University of Manchester, UK, pp. 1-46 in ZooKeys 4 (4) on page 5, DOI: 10.3897/zookeys.4.32, http://zenodo.org/record/576421, {"references":["Melvill JC, Abercrombie A (1893) The Marine Mollusca of Bombay. Memoirs and Proceedings of the Manchester Literary and Philosophical Society (4 th series) 7: 17 - 51."]}