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Duosphaeridium nudum
From Fensome et al., 2019:
Duosphaeridium nudum (Cookson, 1965a, p.87, pl.10, figs.1–4) Loeblich Jr. and Loeblich III, 1968, p.211. Holotype: Cookson, 1965a, pl.10, fig.1. Originally Diphyes, subsequently (and now) Duosphaeridium. This combination was not validly published by Davey and Williams (1966b, p.97), since these authors did not fully reference the basionym. Age: Late Eocene.
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Original description: Cookson, 1965, p.87: Diphyes nudum
Both parts of the shell without appandages. Anterior portion slightly larger than posterior portion, almost sphaerical with large apical archaeopyle. Wall c. 2 µm thick, smooth in profile, faintly dotted to finely granular in surface view.
Posterior portion slightly smaller than the anterior portion with convex sides and a slight apical prominence with a small opening; wall c. 1 µm thick, smooth in profile, faintly dotted or finely granular in surface view the granules when developed being arranged in regular longitudinal rows as in D. colligerum.
Dimensions: Holotype - overall length 55 µm, anterior part 35 µm wide, posterior part 32 µm wide. Range - overall length 47-65 µm, width of anterior part 31-42 µm, width of posterior part 26-36 µm.
Duosphaeridium nudum (Cookson, 1965a, p.87, pl.10, figs.1–4) Loeblich Jr. and Loeblich III, 1968, p.211. Holotype: Cookson, 1965a, pl.10, fig.1. Originally Diphyes, subsequently (and now) Duosphaeridium. This combination was not validly published by Davey and Williams (1966b, p.97), since these authors did not fully reference the basionym. Age: Late Eocene.
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Original description: Cookson, 1965, p.87: Diphyes nudum
Both parts of the shell without appandages. Anterior portion slightly larger than posterior portion, almost sphaerical with large apical archaeopyle. Wall c. 2 µm thick, smooth in profile, faintly dotted to finely granular in surface view.
Posterior portion slightly smaller than the anterior portion with convex sides and a slight apical prominence with a small opening; wall c. 1 µm thick, smooth in profile, faintly dotted or finely granular in surface view the granules when developed being arranged in regular longitudinal rows as in D. colligerum.
Dimensions: Holotype - overall length 55 µm, anterior part 35 µm wide, posterior part 32 µm wide. Range - overall length 47-65 µm, width of anterior part 31-42 µm, width of posterior part 26-36 µm.