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Isabelidinium druggii
Isabelidinium druggii (Stover, 1974) Lentin and Williams, 1977
NOW Manumiella. Originally Deflandrea, subsequently Isabelia (combination illegitimate), thirdly Isabelidinium, fourthly (and now) Manumiella.
Taxonomic senior synonym: Broomea (as and now Manumiella) seelandica, according to Firth (1987, p.213) — however, Thorn et al. (2009, p.443) retained Manumiella druggii.
Taxonomic junior synonym: Isabelidinium tingitanense, according to Lentin and Williams (1985, p.201).
Holotype: Stover, 1974, pl.1, fig.3a-b
Paratype: Stover, 1974
Locus typicus: Flounder-2 well, Australia
Stratum typicum: Early-Middle Paleocene
Original diagnosis: Stover, 1974, p.171: Deflandrea druggii
Outline of periphragm in dorso-ventral view is broadly elliptical, rarely elongate and with a shallow antapical concavity which separates poorly developed antapical horns. Apical margin may be evenly rounded or a short, broadly-based, blunt apical horn may be present. Periphragm is about 1 µm thick, and is smooth, scabrate or irregularly granulate with the sculptural features varying in diameter from ca. 0.5 µm to 2.0 µm. Usually the coarser sculpturing is concentrated on the areas beyond the limits of the endoblast. Surface of periphragm lacks traces of tabulation except for small intercalary archeopyle .
Endoblast outline circular or nearly so in dorso-ventral view, commonly modified by folding; endoblast occupies a major part of the pericoel, and is not in contact laterally with the inner surface of the periphragm. Endophragm is ca. 1 µm thick, smooth or faintly scabrate. No opening observed in the endophragm in a position corresponding to the archeopyle in the periphragm. Operculum is relatively small, usually with a narrow apical margin, oblique and slightly convex sides, rounded antapical corners and is hinged antapically.
Dimensions: Specimens vary in width (92-103 µm) and length (104-122 µm); length: width ratio lies between 1:0.83 and 1:0.93. In nearly all specimens in which folding of the endoblast is not severe, its width exceeds its height.
NOW Manumiella. Originally Deflandrea, subsequently Isabelia (combination illegitimate), thirdly Isabelidinium, fourthly (and now) Manumiella.
Taxonomic senior synonym: Broomea (as and now Manumiella) seelandica, according to Firth (1987, p.213) — however, Thorn et al. (2009, p.443) retained Manumiella druggii.
Taxonomic junior synonym: Isabelidinium tingitanense, according to Lentin and Williams (1985, p.201).
Holotype: Stover, 1974, pl.1, fig.3a-b
Paratype: Stover, 1974
Locus typicus: Flounder-2 well, Australia
Stratum typicum: Early-Middle Paleocene
Original diagnosis: Stover, 1974, p.171: Deflandrea druggii
Outline of periphragm in dorso-ventral view is broadly elliptical, rarely elongate and with a shallow antapical concavity which separates poorly developed antapical horns. Apical margin may be evenly rounded or a short, broadly-based, blunt apical horn may be present. Periphragm is about 1 µm thick, and is smooth, scabrate or irregularly granulate with the sculptural features varying in diameter from ca. 0.5 µm to 2.0 µm. Usually the coarser sculpturing is concentrated on the areas beyond the limits of the endoblast. Surface of periphragm lacks traces of tabulation except for small intercalary archeopyle .
Endoblast outline circular or nearly so in dorso-ventral view, commonly modified by folding; endoblast occupies a major part of the pericoel, and is not in contact laterally with the inner surface of the periphragm. Endophragm is ca. 1 µm thick, smooth or faintly scabrate. No opening observed in the endophragm in a position corresponding to the archeopyle in the periphragm. Operculum is relatively small, usually with a narrow apical margin, oblique and slightly convex sides, rounded antapical corners and is hinged antapically.
Dimensions: Specimens vary in width (92-103 µm) and length (104-122 µm); length: width ratio lies between 1:0.83 and 1:0.93. In nearly all specimens in which folding of the endoblast is not severe, its width exceeds its height.