Abstract
Allozyme structures of Tapes philippinarum, Tapes decussatus, Venerupis aurea and Paphia undulata were electrophoretically analysed and species similarities established. High rates of polymorphism and significant Hardy‐Weinberg disequilibria were found. In T. decussatus and V. aurea high levels of both intra‐ and inter‐population genotypic structuring, possibly related to year‐cohort heterogeneities, were ascertained. In T. philippinarum no in‐trapopulation genotypic variance was found, but a high level of an interpopulation genotypic heterogeneity was apparent, as a possible outcome of its introduction in the Adriatic lagoons from different hatchery stocks. Nei's genetic distances were also evaluated and dendrograms obtained. A clear inconsistency emerged between the generic allocation of the taxa and allozyme data, since T. philippinarum proved the most dissimilar to the congeneric T. decussatus.
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