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Canningia rotundata
From Fensome et al., 2019:
Canningia? rotundata Cookson and Eisenack, 1961a, p.72, pl.12, figs.1–5. Holotype: Cookson and Eisenack, 1961a, pl.12, fig.1. NOW Aptea. Originally Canningia, subsequently Canningia?, thirdly Batiacasphaera, fourthly (and now) Aptea. Questionable assignment: Stover and Evitt (1978, p.25). Taxonomic junior synonyms: Cyclonephelium paucimarginatum and Circulodinium vermiculatum, both according to Fensome et al. (2019a, p.17). Age: Senonian.
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Original description: [Cookson and Eisenack, 1961, p.72]:
Description:
Shell nearly spherical in outline, mostly somewhat broader than long, flat in the present state of preservation, usually with a short broadly rounded apical horn. Antapex rounded or with a slight median prominance. Wall of variable thickness, c 2-5 µm, closely covered with a dense indistinctly vermiculate pattern. The shell opens by the complete detachment of the apex along an approximately straight line.
Dimensions:
Type: length 87 µm, breadth 90 µm.
Range: length 87-105 µm, breadth 90-132 µm.
Canningia? rotundata Cookson and Eisenack, 1961a, p.72, pl.12, figs.1–5. Holotype: Cookson and Eisenack, 1961a, pl.12, fig.1. NOW Aptea. Originally Canningia, subsequently Canningia?, thirdly Batiacasphaera, fourthly (and now) Aptea. Questionable assignment: Stover and Evitt (1978, p.25). Taxonomic junior synonyms: Cyclonephelium paucimarginatum and Circulodinium vermiculatum, both according to Fensome et al. (2019a, p.17). Age: Senonian.
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Original description: [Cookson and Eisenack, 1961, p.72]:
Description:
Shell nearly spherical in outline, mostly somewhat broader than long, flat in the present state of preservation, usually with a short broadly rounded apical horn. Antapex rounded or with a slight median prominance. Wall of variable thickness, c 2-5 µm, closely covered with a dense indistinctly vermiculate pattern. The shell opens by the complete detachment of the apex along an approximately straight line.
Dimensions:
Type: length 87 µm, breadth 90 µm.
Range: length 87-105 µm, breadth 90-132 µm.