Spicule formation in the gorgonian coral Pseudoplexaura flagellosa. 2: Calcium localization by antimona te precipitation
Abstract:Experimentally induced deposits of calcium pyroantimonate are prominently associated with the extracellular space, epithelial microvilli and plasma membranes in the tissues of the gorgonian Pseudoplexaura flagellosa. Three types of cells are associated with internal deposits of antimonate: zooxanthellae, nematocytes and sclerocytes. Label in zooxanthellae is associated with the formation of oxalate crystals characteristic of aging cells. Precipitate in nematocytes is confined primarily to the nucleus and cytoplasm and is largely excluded from the nematocyst capsule, perhaps representing a translocation artifact. Of the two types of sclerocytes in this species, only the primary sc1erocytes are labelled internally, particularly within electron lucent vesicles and their membranes. Additional spicule growth is extracellular, and is associated with the pseudopodia of secondary sclerocytes. Antimonate precipitates confirm this pattern.
Document Type: Research Article
Publication date: 1987-03-01
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