Chytroeisphaeridia explanata, Bujak in Bujak et al., 1980

Holotype: Bujak et al., pl.13, figs.13-14
Stratum typicum: Alum Bay, Isle of Wight, southern England
Locus typicus: Late Eocene

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Original description: [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.