Batiacasphaera explanata, (Bujak in Bujak et al., 1980), Islam, 1983

Originally Chytroeisphaeridia, subsequently (and now) Batiacasphaera. The transfer of this species to Batiacasphaera is not attributable to Matsuoka, 1984.

Holotype: Bujak et al., pl.13, figs. 13-14
Stratum typicum: Alum Bay, Isle of Wight, southern England
Age: Mid Eocene (see Aubry, 1986).

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Original description as Chytroeisphaeridia explanata: [Bujak in Bujak et al., 1980]:

Diagnosis:
Autocyst spherical to ovoidal. Autophragm smooth to chagrinate, without indication of paracingulum or parasulcus.
Paratabulation absent except near the archaeopyle margin.
Archaeopyle apical, tetratabular, with well-developed accessory archaeopyle sutures that delimit the lateral margins of paraplates 1"-6" and a.s. The operculum is detached.

Dimensions:
Autocyst length (without operculum) = 44-66 µm, breadth = 48-70 µm.