Ref ID : 4378
Stephen C. Landers; The Fine Structure of Secretion in Hyalophysa chattoni: Formation of the Attachment Peduncle and the Chitinous Phoretic Cyst Wall. J.Protozool. 38(2):148-157, 1991
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The settling tomite stage of apostome Hyalophysa chattoni secretes a phoretic cyst wall composed of chitin, mucopolysaccharides, and protein. Within 1.5 hr after settling, an electron-dense proteinaceous cyst layer (the outer layer) is formed from secretion originating at the base of the kineties and from the thick pellicular layer between the kineties. The inner cyst layer, composed primarily of chitin (acidic and neutral polysaccharides are also present), is secreted across the entire cell surface. Cyst wall formation is completed within 6 hr. The fine structure of endocyst secretion resembles stages in the secretion of chitin by fungi, yeasts, and arthopods. A proteinaceous attachement peduncle is secreted to anchor the cell to shrimp host and is formed by the release of electron-dense secretory bodies from the cell's ventral surface.