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Saeptodinium gravattense
Saeptodinium gravattense Harris, 1974
Holotype: Harris, 1974, pl.1, fig.2
Locus typicus: Darra Formation, Queensland,
Stratum typicum: Palaeocene
Original diagnosis: Harris, 1974, p.162
A Saeptodinium of ovoid or peridinioid form. Endocorpus ovoidal, enclosed by the pericorpus which has a bulge on the epitract and two slight subequal bulges at the antapex. Periphragm smooth as is the endophragm. The helicoid laevorotatory girdle is relatively wide.
Original descripiton: Harris, 1974, p.162
Both the periphragm and endophragm are smooth to scabrate and do not show any features of tabulation or any indication of archeopyle formation. The apices of many specimens bear a thickened plug, the function of which is not known. The degree of bulge, and the accompanying indentation in the antapical region is variable from almost no bulge to forms where the indentation is 2-5 µm deep. The epitract is subrounded but does not show some development of an apical horn. The epitract and hypotract are of approximately equal sizes. The pericoel is 3-5 µm wide and the sulcal groove 5 - 8 µm wide. The periphragm and endophragm are of approximately equal thickness, 0.5 µm.
Dimensions: Pericorpus length 50 - 62 µm, breadth 45 - 60 µm. Endocorpus: length 49 - 55 µm, breadth 37 - 50 µm.
Holotype: Harris, 1974, pl.1, fig.2
Locus typicus: Darra Formation, Queensland,
Stratum typicum: Palaeocene
Original diagnosis: Harris, 1974, p.162
A Saeptodinium of ovoid or peridinioid form. Endocorpus ovoidal, enclosed by the pericorpus which has a bulge on the epitract and two slight subequal bulges at the antapex. Periphragm smooth as is the endophragm. The helicoid laevorotatory girdle is relatively wide.
Original descripiton: Harris, 1974, p.162
Both the periphragm and endophragm are smooth to scabrate and do not show any features of tabulation or any indication of archeopyle formation. The apices of many specimens bear a thickened plug, the function of which is not known. The degree of bulge, and the accompanying indentation in the antapical region is variable from almost no bulge to forms where the indentation is 2-5 µm deep. The epitract is subrounded but does not show some development of an apical horn. The epitract and hypotract are of approximately equal sizes. The pericoel is 3-5 µm wide and the sulcal groove 5 - 8 µm wide. The periphragm and endophragm are of approximately equal thickness, 0.5 µm.
Dimensions: Pericorpus length 50 - 62 µm, breadth 45 - 60 µm. Endocorpus: length 49 - 55 µm, breadth 37 - 50 µm.