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Isabelidinium dakotaense
Isabelidinium dakotaensis (Stanley, 1965) Lentin and Williams, 1977
Now Chatangiella?. Originally Deflandrea, subsequently Isabelidinium, thirdly (and now) Chatangiella?. See also Isabelia (combination illegitimate).
Holotype: Stanley, 1965, pl.19, figs.1-3
Locus typicus: S Dakota, USA
Stratum typicum: Paleocene
Original diagnosis: Stanley, 1965, p.218: Deflandrea dakotaensis
Deflandrea dakotaensis resembles D. bakeri Deflandre and Cookson and D. pellucia Cookson and Eisenack. lt differs from those species in that the cell membrane is smooth and there is no or only a faint suggestion of a girdle. It differs from D. phosphoritica Eisenack in that the posterior region is much longer. Also, D. dakotaensis lacks the girdle and the furrow of D. phosphoritica.
Original description: Stanley, 1965, p.217: Deflandrea dakotaensis
Outer cyst distinctly anterior-posteriorly elongated with a bulge in the equatorial region and dorsoventrally flattened; length about 120 Ám, width approximately 84 Ám; membrane smooth, approximately 1 Ám thick in anterior portion of outer cyst and thins to a fraction of a micron posteriorly. Apical horn about 25 Ám in length and terminated with a small, solid papilla. Antapical horns approximately equal in size with the left one slightly longer than the right horn; antapical horns connected to each other by a membrane. Interior cyst anterior-posteriorly flattened, granular. Furrow and girdle not observed. Intercalary archeopyle clistinct with posterior side longer than anterior side.
Now Chatangiella?. Originally Deflandrea, subsequently Isabelidinium, thirdly (and now) Chatangiella?. See also Isabelia (combination illegitimate).
Holotype: Stanley, 1965, pl.19, figs.1-3
Locus typicus: S Dakota, USA
Stratum typicum: Paleocene
Original diagnosis: Stanley, 1965, p.218: Deflandrea dakotaensis
Deflandrea dakotaensis resembles D. bakeri Deflandre and Cookson and D. pellucia Cookson and Eisenack. lt differs from those species in that the cell membrane is smooth and there is no or only a faint suggestion of a girdle. It differs from D. phosphoritica Eisenack in that the posterior region is much longer. Also, D. dakotaensis lacks the girdle and the furrow of D. phosphoritica.
Original description: Stanley, 1965, p.217: Deflandrea dakotaensis
Outer cyst distinctly anterior-posteriorly elongated with a bulge in the equatorial region and dorsoventrally flattened; length about 120 Ám, width approximately 84 Ám; membrane smooth, approximately 1 Ám thick in anterior portion of outer cyst and thins to a fraction of a micron posteriorly. Apical horn about 25 Ám in length and terminated with a small, solid papilla. Antapical horns approximately equal in size with the left one slightly longer than the right horn; antapical horns connected to each other by a membrane. Interior cyst anterior-posteriorly flattened, granular. Furrow and girdle not observed. Intercalary archeopyle clistinct with posterior side longer than anterior side.