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1 Annales Zoologici

1 1997

1 Korniushin A. V.

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Growth and development of the outer demibranch in freshwater clams [Mollusca, Bivalvia]: a comparative study

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Korniushin A. V.

Annales Zoologici

1996-1997

tom 46

nr 1-2

Ontogenesis of the outer demibranch of ctenidium was observed in the different groups of freshwater bivalvos: najades (Unionidae), fingernail and pill clams (Sphaeriidae), and Dreissena, with some data on Corbicula (Corbiculidae) and Hypanis (Cardiidae) also presented. Established are the sequence of stages as well as growth patterns. Three different strategies of the outer demibranch growth and development specific for unionids, sphaeriids, and Dreissena, are described. Probable phylogenetic transition between these strategies is discussed. Some trends of the evolution of gill ontogenesis within the family Sphaeriidae are traced up. It was shown that the stage at which the outer demibranch appears is an important morphogenetic factor determining size and position of the organ in fingernail and pill clams, and, presumably, in bivalve molluscs in general.