Adeliesphaera ohanlonii, Bijl and Brinkhuis, 2015, p. 90–92, pl.1G–R, pl.2A–L,N,O, pl.3A–F, pl.4, figs.A–G.

Synonymy: Dinocyst gen et sp. indet. (Bijl et al., 2013b plate VII, h, i; plate VIII, n, o)

Holotype: Bijl and Brinkhuis, 2015, pl.2A–B; Sample 318-U1356A-105R-1 W, 35–37 cm, Slide 2, England Finder coordinates S50 Plate II, A, B
Paratype: Sample 318-U1356A-105R-1 W, 75–77 cm, Slide 2, England Finder coordinates K42-2 Plate II; D, E
Type locality: Eocene strata fromIODP Hole U1356A, Wilkes LandMargin, Antarctica. Lithological Unit XI.
Stratigraphic range: top half of chron C24n.3n (Tauxe et al., 2012; Bijl et al., 2013b, 2014), in the Geomagnetic Polarity Time Scale of Vandenberghe et al. (2012) this equates to a range between 53.7 and 53.4 Ma.
Age: Ypresian.

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Original description: [Bijl and Brinkhuis, 2015]:

Diagnosis:
A species of Adeliesphaera gen. nov. with a relatively thin cyst wall that is ornamented with non-tabular granulae, giving it a papillate appearance. Tabulation is not discernible, apart from the archeopyle margin. Archeopyle is equi-dimensional, simple polyplacoid and involves the loss of the apical series.

Description:
The specimens of the type material show only small variations in size and the expression of the antapical horn, and all lack secondary compression. All specimens observed have an equi-dimensional operculum/archeopyle, and the overall geometry of the cyst is globular. Cysts of Adeliesphaera ohanlonii sp. nov. lack sutural or penitabular ornamentation reflecting tabulation; the granulae on the cyst wall seem non-tabular.

Dimensions:
Holotype: 48.6 × 50.0 μm (length (l) × width (w)).
Paratype: 45.7 × 50.0 μm (l × depth (d)). Average dimensions (n = 22): 47.1 (40.0–57.1) × 47.8 (42.9–57.1) × 45.4 (41.4–51.4) μm (l × w × d).