Back
Manumiella druggii
Manumiella (Stover, 1974, p.171, pl.1, figs.3a-b,4; text-fig.3B) Bujak and Davies, 1983, p.161.
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, figs.3a-b.
Age: early-mid 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 Ám thick, and is smooth, scabrate or irregularly granulate with the sculptural features varying in diameter from ca. 0.5 Ám to 2.0 Ám. 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 Ám 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.
Supplemental description: Hultberg, 1985, p. 137
Circumcavate cyst, composed of endophragm and periphragm, separated by a pericoel. The surface of both endophragm and periphragm is smooth. The shape of the endophragm is rounded rhomboidal. The shape of the periphragm is rhomboidal, with a very small dorsoapical protrusion, and a very slight antapical indentation. No trace of paratabulation is present, except the archeopyle.
The archeopyle is intercalary, type I, formed by the detachment of paraplate 2a. The archeopyle is lati-deltaform. Operculum free. Paracingulum is indicated by folds in the periphragm. The paracingulum is almost circular. Parasulcus is not indicated. 94-120 µm (length), 54-95 µm (breadth).
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, figs.3a-b.
Age: early-mid 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 Ám thick, and is smooth, scabrate or irregularly granulate with the sculptural features varying in diameter from ca. 0.5 Ám to 2.0 Ám. 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 Ám 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.
Supplemental description: Hultberg, 1985, p. 137
Circumcavate cyst, composed of endophragm and periphragm, separated by a pericoel. The surface of both endophragm and periphragm is smooth. The shape of the endophragm is rounded rhomboidal. The shape of the periphragm is rhomboidal, with a very small dorsoapical protrusion, and a very slight antapical indentation. No trace of paratabulation is present, except the archeopyle.
The archeopyle is intercalary, type I, formed by the detachment of paraplate 2a. The archeopyle is lati-deltaform. Operculum free. Paracingulum is indicated by folds in the periphragm. The paracingulum is almost circular. Parasulcus is not indicated. 94-120 µm (length), 54-95 µm (breadth).