Abstract
This is the first demonstration that the organic matrix appears at the decalcified site of the skeleton in a juvenile coral of Fungia fungites (Linnaeus). This matrix was secreted by the calicoblastic layer and is composed of fibrous matters as seen in mesoglea. If formed a thick sheet at the advanced stage. The amino acid composition of this matrix was similar to that in the skeleton rather than mesogleal protein. Morphologic and functional features suggest that the organic sheet must be similar to the sheet which is secreted extracellularly by planula larva at the time of settlement. The sheet in F. fungites may have a role of protecting calicoblastic epithelium from exposure as a result of skeletal dissolution.
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