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Peridinium hansonianum
Peridinium hansonianum Traverse, 1955
Now Saeptodinium. Originally Peridinium, subsequently Palaeoperidinium, thirdly (and now) Saeptodinium.
Holotype: Traverse, 1955, pl.13, fig. 147
Locus typicus: Vermont, Brandon Lignite, Brandon Formation
Stratum typicum: Late Oligocene
Original diagnose: Traverse, 1955, p.77
Very unusual microfossils grossly resembling crushed paperbags or collapsed rubber balls. The "collapsed bags" are much folded and wrinkled. Because of the folding, the fossils often have the appearance of being one sac within another. One, or sometimes 2 or 3, folds continue into snout-like processes. The larger of these processes are terminated by collar-like openings. If there are several processes, one is usually much longer than the others. Some specimens clearly show a belt-like, indented groove about 6 µm wide running around a diameter of the microfossil. This represents the "equatorial groove" of this group of flagellates. The entire surface of the microfossil is covered with very tiny but pronounced papillae. Overall size: ca. 70 µm by 80 µm.
Now Saeptodinium. Originally Peridinium, subsequently Palaeoperidinium, thirdly (and now) Saeptodinium.
Holotype: Traverse, 1955, pl.13, fig. 147
Locus typicus: Vermont, Brandon Lignite, Brandon Formation
Stratum typicum: Late Oligocene
Original diagnose: Traverse, 1955, p.77
Very unusual microfossils grossly resembling crushed paperbags or collapsed rubber balls. The "collapsed bags" are much folded and wrinkled. Because of the folding, the fossils often have the appearance of being one sac within another. One, or sometimes 2 or 3, folds continue into snout-like processes. The larger of these processes are terminated by collar-like openings. If there are several processes, one is usually much longer than the others. Some specimens clearly show a belt-like, indented groove about 6 µm wide running around a diameter of the microfossil. This represents the "equatorial groove" of this group of flagellates. The entire surface of the microfossil is covered with very tiny but pronounced papillae. Overall size: ca. 70 µm by 80 µm.