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La poliploidía es un carácter inusual en moluscos bivalvos. Sin embargo, datos citogenéticos documentados para especies de la subfamilia Sphaeriinae (familia Sphaeriidae) del hemisferio norte muestran números cromosómicos que varían desde 36 hasta ca. 247. La almeja dulceacuícola Musculium argentinum (D'Orbigny 1835) presenta un número cromosómico 2n = ca. 130, lo cual muestra que la poliploidía también estaría presente en esféridos sudamericanos. Estos antecedentes citogenéticos sugieren que Sphaeriinae podría constituir un complejo poliploide maduro.The polyploidy is an unusual character in bivalve mollusks. However, cytogenetic data documented for north-hemispheric species of the subfamily Sphaeriinae (family Sphaeriidae), showed chromosome numbers ranging from 36 to ca. 247. The freshwater clam Musculium argentinum (D'Orbigny 1835) has a polyploid chromosome number 2n = ca. 130, which shows that polyploidy likewise may be present in South American sphaeriids. These cytogenetic data suggest that the subfamily Sphaeriinae could constitute a mature polyploid complex

REGISTRO DE POLIPLOIDIA EN LA ALMEJA DULCEACUICOLA MUSCULIUM ARGENTINUM (D'ORBIGNY 1835) (SPHAERIIDAE, VENEROIDA)