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, Corbicula fluminea (Müller, 1774 and C. largillierti (Philippi, 1844) were recorded at the Río de la Plata River. During the 1980's, C. largillierti was found on a continuous fringe in the shore of that river, while C. fluminea was only found North of Buenos Aires' harbor. Ten years later, C. fluminea spread to Punta Indio, while C. largillierti remained restricted to tributary streams. The density and size frequency distribution of both species were compared with previous data from samplesdoi:10.3897/zoologia.34.22181 fatcat:zimo3hict5gebkt3zvdoa25fdq