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Chatangiella dakotaensis
Chatangiella? dakotaensis, (Stanley, 1965), Stover and Evitt, 1978
Originally Deflandrea, subsequently Isabelia (combination illegitimate), thirdly Isabelidinium, fourthly (and now) Chatangiella? Questionable assignment: Stover and Evitt (1978, p.99); and Lebedeva (2000, p.112,121).
Holotype: Stanley, 1965, pl.19, figs.1-3
Locus typicus: South Dakota, USA
Stratum typicum: Paleocene
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Original description as Deflandrea dakotaensis: [Stanley, 1965, p. 217-218]:
Diagnosis:
Deflandrea dakotaensis resembles D. bakeri Deflandre and Cookson and D. pellucia Cookson and Eisenack. It 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.
Description:
Outer cyst distinctly anterior-posteriorly elongated with a bulge in the equatorial region and dorsoventrally flattened; length about 120 µm, width approximately 84 µm; membrane smooth, approximately 1 µm thick in anterior portion of outer cyst and thins to a fraction of a µm posteriorly. Apical horn about 25 µm 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 distinct with posterior side longer than anterior side.
Originally Deflandrea, subsequently Isabelia (combination illegitimate), thirdly Isabelidinium, fourthly (and now) Chatangiella? Questionable assignment: Stover and Evitt (1978, p.99); and Lebedeva (2000, p.112,121).
Holotype: Stanley, 1965, pl.19, figs.1-3
Locus typicus: South Dakota, USA
Stratum typicum: Paleocene
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Original description as Deflandrea dakotaensis: [Stanley, 1965, p. 217-218]:
Diagnosis:
Deflandrea dakotaensis resembles D. bakeri Deflandre and Cookson and D. pellucia Cookson and Eisenack. It 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.
Description:
Outer cyst distinctly anterior-posteriorly elongated with a bulge in the equatorial region and dorsoventrally flattened; length about 120 µm, width approximately 84 µm; membrane smooth, approximately 1 µm thick in anterior portion of outer cyst and thins to a fraction of a µm posteriorly. Apical horn about 25 µm 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 distinct with posterior side longer than anterior side.