Morphology and function in postmetamorphalAbra alba(Bivalvia: Tellinacea)

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Abstract
The morphological changes were studied from settling until the inhalant siphon was fully developed (i.e. up to a shell length of 1.5 mm). Postmetamorphal A. alba lack the inhalant siphon and particle uptake takes place through the pedal gape. At this stage the bivalve is very active and moves rapidly in the sediment, also under anoxic conditions. When the inhalant siphon is developed the method of uptake is changed. Most particles are now taken in through this siphon and only small amounts through the pedal gape. The currents which transport material in the mantle cavity and on the palp-surface are mainly the same in juveniles and adults. A cruciform muscle develops before development of the inhalant siphon. Its function is still a matter of discussion. There seems to be no morphological differences between juveniles and adults, except for the formation of the inhalant siphon and the cruciform muscle. Change from postlarval feeding behaviour to adult feeding behaviour occurs at approximately 1 mm shell lenght, or after 3 months of benthic life under normal conditions.

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