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Ultrastructure of vegetative cysts of Pyrocystis (Dinophyta), with special reference to PAS bodies and trichocysts

The ultrastructure of two dinoflagellates, the lunate Pyrocystis lunula and the spherical Pyrocystis noctiluca, is described using fluorescence microscopy, cryo-scanning electron microscopy and transmission electron microscopy, with an emphasis on periodic acid-Schiff reagent (PAS) bodies and trichocysts. Seen in section, the cytoplasm of Pyrocystis cells is separated into two distinct areas: a core area and a peripheral area. The core area contains most of the cellular organelles, including the PAS bodies. Trichocysts exist in both species, even though the cyst wall contains no pores for ejection. A possible role of trichocysts in dinoflagellate cysts is discussed.