Bioclaustration

Bioclaustration is kind of interaction when one organism (usually soft bodied) is embedded in a living substrate (i.e. skeleton of another organism); it means "biologically walled-up".

In case of symbiosis the walling-up is not complete and both organisms stay alive (Palmer and Wilson, 1988).

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The star-shaped holes ( Catellocaula vallata ) in this Upper Ordovician bryozoan represent a soft-bodied organism preserved by bioclaustration in the bryozoan skeleton. (See Palmer and Wilson, 1988)