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Dinoflagellates: Two specimens of Deflandrea showing a dorsal view with the operculum in place (left), and a ventral view. Paleocene. Virginia. Scale bar = 5 microns. Scanning electron micrograph. Courtesy of L. E. Edwards, U. S. G. S.
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Dinoflagellate: Isabelidinium showing an intercalary archeopyle. Cretaceous in age, but reworked into Oligocene deposits. Mississippi. Specimen is about 100 microns in size. Light micrograph. Courtesy of L. E. Edwards, U. S. G. S.
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Dinoflagellates: Muratodinium and Fibrocysta, each cyst showing precingular archeopyles. Muralodinium (left) has fibrous parasutrual septa outlining the paratabulation. Fibrocysta (right) has nontabular processes. Eocene. Specimens are about 60 microns in size. Light micrographs. Courtesy of L. E. Edwards, U. S. G. S.
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Dinoflagellate: Nannoceratopsis showing a cingular archeopyle. Light micrograph. Jurassic in age, but reworked into Cretaceous deposits in Alaska. Specimen is about 100 microns in size. Light micrograph. Courtesy of L. E. Edwards, U. S. G. S.
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Dinoflagellate: Dinogymnium. This specimen may be a fossil theca. Specimen is about 100 microns in size. Light micrograph. Cretaceous, Georgia. Courtesy of L. E. Edwards, U. S. G. S.
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Dinoflagellate: Impagidinium. Showing well-developed paratabulation in three levels of focus. Specimen is about 100 microns in size. Light micrographs. Courtesy of L. E. Edwards, U. S. G. S.
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