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要旨

The chronology of the invasion by Corbicula of the Central and the eastern part of South America is revised based on the literature and museum collection records. The occurrence of Corbicula largillierti (PHILIPPI, 1844) and Corbicula fluminea (MULLER, 1774) are reported for the first time for the northern part of the Pantanal of Mato Grosso, at the upper part of the Paraguay River, a tributary of the large Parana Basin. Corbiculidae were sampled at three different localities, on the banks of the Cuiaba River, near Cuiabi, capital of Mato Grosso State. The highest population density was 192 i/m(2). The shell length of the sampled population of Corbicula largillierti varied between 5.42 and 17.53 mm and Corbicula fluminea varied between 14.74 and 27.33 mm. The age for the sampled specimens of C. fluminea was estimated to be near three years and the date of arrival of the species in the Pantanal is probably 1996 or 97. The relationship between shell length, heigh, width and weight (shell and wet tissues) was also calculated and multivariate ANOVA test revealed significant differences between the species. The standard curve for the weight and length relationship, reflecting growth, was estimated using the exponential pattern