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Protoperidinium (pro-toe-perry-din-ee-um) heterotrophic dinoflagellate. This is a cyst, but we can see that the margins of the circumferential groove have projecting margins, and there is an anterior point and two short posterior spines. Phase contrast.
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Ventral view showing girdle and sulcus. Armouring of the cell is also evident.
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Theca remaining from a deceased cell showing the grooves in which the flagella lie, and, in profile, the lists or shelves that project around the girdle.
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A large distinctive species. It has a long apical horn and long divergent antapical horns. P. depressum is a cosmopolitan species.
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The two faces of ...
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A medium-sized cell with short antapical horn and and winged antapical spines. The species can be confused with P. pallidum. A distinguishing feature is a prominent winged spines originating from a sulcal list.
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This micrograph emphasizes the armored character of the genus.
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An armoured dinoflagellate.
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The cells are pyriform with a long apical horn and a rounded hypotheca. There are two long, winged antapical spines. The girdle is right handed and bears distinct lists supported by spines.
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Peridinium divergens.
